Some packages we probably don't need to automatically create debug
outputs for. We could probably drop the debug outputs for all the
packages that have them in commencement except for the -final ones.

(ins)efraim@3900XT ~/workspace/guix$ du -sch \
/gnu/store/4qn544j2a062s5kbj1bfxbak060zbq4k-gcc-cross-boot0-7.5.0 \
/gnu/store/vx0x26r5q7z99rih8k1mxyf2bih3vnpc-gcc-cross-boot0-7.5.0-lib \
/gnu/store/nbg9qafs2x24bj7lm7km4wg2bfjsp64f-gcc-cross-boot0-7.5.0-debug
95M     /gnu/store/4qn544j2a062s5kbj1bfxbak060zbq4k-gcc-cross-boot0-7.5.0
11M     /gnu/store/vx0x26r5q7z99rih8k1mxyf2bih3vnpc-gcc-cross-boot0-7.5.0-lib
323M    /gnu/store/nbg9qafs2x24bj7lm7km4wg2bfjsp64f-gcc-cross-boot0-7.5.0-debug
429M    total

short list:
gnu-make-boot0
coreutils-boot0
gcc-boot0
glibc-final-with-bootstrap-bash (maybe)

we can then also adjust the outputs of gcc-final to not delete the debug
output of gcc-boot0, which it inherits from.

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