bug#34216: Shroud require xclip for x clipboard

[Efraim Flashner <efraim@flashner.co.il>]

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On Sun, Jan 27, 2019 at 03:47:43PM +0530, Amar Singh wrote:
> I've added xclip as a propagated input for shroud as otherwise `shroud
> show --clipboard` functionality didn't work, neither primary or
> secondary clipboard.
> 
> xclip is about 102 MiB in size, out of which a little more than 60% is
> glibc and gcc.
> 
> I am not sure if this is the best idea though.
> 

$ ./pre-inst-env guix size shroud
store item                                                       total    self
/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4            121.9    44.4  16.7%
/gnu/store/47mrg60wyx6qxj55l9slyl7j4jp3sxgz-icu4c-62.1             105.4    36.4  13.7%
/gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28              37.8    36.3  13.6%
/gnu/store/4sqps8dczv3g7rwbdibfz6rf5jlk7w90-gcc-5.5.0-lib           68.0    30.2  11.3%
/gnu/store/z5pbvw5zrhq8jgg8c4wkywg8psc0km3c-eudev-3.2.5            104.1    14.6   5.5%
/gnu/store/8k4pnixpz73kxvxbjqajgbprjjmmgpxy-util-linux-2.32.1       88.0    12.8   4.8%
/gnu/store/1fl9vk8fpafkws4qyy25vcdfpybxyh1k-guile-2.0.14            90.1    12.6   4.7%
/gnu/store/w862nkwzvv2m3ng5lg5zlic1i962g416-gnupg-2.2.12           238.8    10.1   3.8%
/gnu/store/yl1vi61qmvvh83amwiwaik7s7jc03n5z-openssl-1.0.2p          74.1     6.1   2.3%
/gnu/store/4h03mp5nggsblscs6j0n7s6sbpfy6kxh-ncurses-6.1              5.9     5.9   2.2%
/gnu/store/hnj08aavzpsi72wvi4qqrp5dqbyqxqqs-libxcb-1.13             74.5     5.6   2.1%
/gnu/store/8baabfjazsr7s4y0jig1sn84xnxf75xa-libx11-1.6.6            79.5     5.0   1.9%
/gnu/store/z0g1wsiw2n5d1hspbj7xkhj6vnc2qlvp-gnutls-3.5.18          128.3     4.5   1.7%
/gnu/store/vmmbzvpmnb0m5rqdhy207a3y8vrrzfvq-bdb-5.3.28              72.4     4.4   1.7%
/gnu/store/1xnvamrhmlhkqsnaj3z32kz3hgn3w7yz-mit-krb5-1.16.1         73.1     4.2   1.6%
/gnu/store/pba3xzrkq2k4wgh3arif4xpkblr5qz2n-sqlite-3.24.0           79.4     4.2   1.6%
/gnu/store/bc0ay3sk7aciykqag4qjbcsl3a03n0yz-openldap-2.4.46        184.6     3.7   1.4%
/gnu/store/mrzq0vrb7h5dzvp18qrzky0az712rcvr-gmp-6.1.2               70.7     2.7   1.0%
/gnu/store/hdwl1lwx0w6s1lmllla9w6yzxblwdp1g-libunistring-0.9.10     70.3     2.4   0.9%
/gnu/store/zzakf905mzla4csi1dn9qpcwmgbxj29b-bash-static-4.4.23       1.5     1.5   0.6%
/gnu/store/87fdwmippyfs01870x5hq7v2lcyfczpi-libgcrypt-1.8.3         71.4     1.5   0.6%
/gnu/store/l98sjns683w5h7yma20as3ybmzn7qrzy-libxt-1.1.5            101.6     1.4   0.5%
/gnu/store/si88gb25621k0w60kij5lxksn8l24664-readline-7.0.5          75.2     1.3   0.5%
/gnu/store/xyiyf12w4i7zf5g5b4ah0bi1mmd6i8xa-pkg-config-0.29.2       69.3     1.3   0.5%
/gnu/store/04vqghzmpqzxpd94h1q931xpmazp5s7g-libgc-7.6.6             69.9     1.2   0.5%
/gnu/store/9425b5dwpfc04bb4p58hsjypxghliyr3-xz-5.2.4                70.2     1.2   0.4%
/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23     38.8     1.0   0.4%
/gnu/store/p6pmv0r9q3cs172q9xjv87avsix26ddc-libgpg-error-1.32       69.9     0.9   0.4%
/gnu/store/cnxzmpgnm32bbi8qqslx9xni18c122a6-nettle-3.4              71.6     0.9   0.3%
/gnu/store/lmzz56h1xll5kbppm5c3b6b4ihvswj26-cyrus-sasl-2.1.26       80.8     0.9   0.3%
/gnu/store/ly9h8d8ychiqj5i8wl14cbmfvk6k2fyn-gdbm-1.18               68.7     0.7   0.3%
/gnu/store/36113mczasb8616f9wyd337k3fkm3506-libatomic-ops-7.6.6      0.7     0.7   0.3%
/gnu/store/6lwn8v33r2z2l2pgky2dnzim3696dwnn-libbsd-0.9.1            68.7     0.7   0.3%
/gnu/store/zzxap7da8d8hjafcnv5330milpr1nj3a-libxmu-1.1.2           102.7     0.6   0.2%
/gnu/store/nlppb4wbapi33g5vdg7x0vp40qzly71p-libice-1.0.9            69.2     0.5   0.2%
/gnu/store/2dk55i5wdhcbh2z8hhn3r55x4873iyp1-libxext-1.3.3           79.9     0.4   0.2%
/gnu/store/pyj39jis185kak73rhgn69mkbd8023sy-libidn2-2.0.5           70.8     0.4   0.2%
/gnu/store/j74aabxwayjl9yfyrm6ni482gykxq48b-bzip2-1.0.6             69.4     0.4   0.2%
/gnu/store/nalqb8wz16srmrcl9qpyh1gaysxralyk-libksba-1.3.5           70.3     0.4   0.1%
/gnu/store/6mzgcp8d965jqy6rb11cal2aawqx6rl3-pcsc-lite-1.8.24       104.5     0.3   0.1%
/gnu/store/c22y67wp1s9jrs26mp2jdw93c7gw3zvp-kmod-25                 70.8     0.3   0.1%
/gnu/store/3xxqwm7axbih9n2m7yaimacznp04d5rw-libsm-1.2.2             89.5     0.3   0.1%
/gnu/store/lm3i15cvw4ybsnf2lsam5nj76kqbjg2k-libtasn1-4.13           68.3     0.3   0.1%
/gnu/store/nq4lsyipmfb0q7g26ra45rwwqrh3x8zw-zlib-1.2.11             68.2     0.2   0.1%
/gnu/store/2d0nciylmcw66nqjfr55hnh85l5fqjfs-libassuan-2.5.2         70.2     0.2   0.1%
/gnu/store/3vlscch2sxybd34qx2ianpg92crm9akm-libxdmcp-1.1.2          68.8     0.2   0.1%
/gnu/store/zk7047byh5yk7qsi8shbnqlz64qsiy8x-libltdl-2.4.6           68.1     0.2   0.1%
/gnu/store/vd35w7c44njixcagxqyqpd81frc3ngpz-libffi-3.2.1            68.1     0.1   0.1%
/gnu/store/9fxvdv33gq5kh3kpi09zc71d9bsj101s-shroud-0.1.1           266.2     0.1   0.0%
/gnu/store/4hjgv0rif8kqmv6mqc8f1igygiz3w2r1-npth-1.5                69.1     0.1   0.0%
/gnu/store/agz9m74v7235h30mc3bdmj2nmyxqga4c-xclip-0.13             102.7     0.1   0.0%
/gnu/store/mawqhgh0bdxpa4gjxs1fjyhwvv6i8w5g-libxau-1.0.8            68.0     0.0   0.0%
total: 266.2 MiB

Looks like xclip is already in the closure of shroud, so maybe we should
just patch the reference to it so shroud can always find xclip.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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