bug#27551: guile-cairo switch to Guile 2.2 breaks (gnu build svg)

[Leo Famulari <leo@famulari.name>]

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On Fri, Jun 30, 2017 at 05:21:08PM -0400, Ludovic Court�s wrote:
> civodul pushed a commit to branch master
> in repository guix.
> 
> commit e3ddb1e83296c10338d35bc687772242b2f5eac6
> Author: Ludovic Courtès <ludo@gnu.org>
> Date:   Fri Jun 30 23:10:46 2017 +0200
> 
>     gnu: guile-cairo: Switch to Guile 2.2.
>     
>     This patch adjusts dependent packages accordingly.
>     
>     * gnu/packages/gtk.scm (guile-cairo)[inputs]: Switch to GUILE-2.2 and
>     GUILE-LIB.
>     (guile-rsvg)[inputs]: Likewise.
>     (guile-present)[inputs]: Likewise.
>     (guile-gnome)[inputs]: Likewise.
>     * gnu/packages/plotutils.scm (guile-charting)[inputs]: Switch go
>     GUILE-2.2.

This commit introduced some problems with (gnu build svg), which
prevents reconfiguring GuixSD:

------
The following derivations will be built:
   /gnu/store/sqwij2775lnlaal4jrv16hys5wjss5az-grub.cfg.drv
   /gnu/store/nldcbaghx031b799mq9bdh8l00hg4fz6-grub-image.png.drv
substitute: updating list of substitutes from 'https://4606.nsupdate.info'... 100.0%
substitute: updating list of substitutes from 'https://4606.nsupdate.info'... 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
;;; Failed to autoload rsvg-handle-new-from-file in (rsvg):
;;; ERROR: missing interface for module (rsvg)
Backtrace:
In ice-9/boot-9.scm:
 160: 9 [catch #t #<catch-closure 8c5e00> ...]
In unknown file:
   ?: 8 [apply-smob/1 #<catch-closure 8c5e00>]
In ice-9/boot-9.scm:
  66: 7 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 6 [eval # #]
In ice-9/boot-9.scm:
2412: 5 [save-module-excursion #<procedure 8e67c0 at ice-9/boot-9.scm:4084:3 ()>]
4089: 4 [#<procedure 8e67c0 at ice-9/boot-9.scm:4084:3 ()>]
1734: 3 [%start-stack load-stack #<procedure 8f6c60 at ice-9/boot-9.scm:4080:10 ()>]
1739: 2 [#<procedure 8f86c0 ()>]
In unknown file:
   ?: 1 [primitive-load "/gnu/store/l8bqrgb009s9806gqdwg4wwq97yff6y7-grub-image.png-builder"]
In ./gnu/build/svg.scm:
  51: 0 [svg->png "/gnu/store/w893227m8wllganabxqx7sn2mgga8083-guix-artwork-6998d30-checkout/grub/GuixSD-fully-black-4-3.svg" ...]

./gnu/build/svg.scm:51:4: In procedure svg->png:
./gnu/build/svg.scm:51:4: In procedure module-lookup: Unbound variable: rsvg-handle-new-from-file
builder for `/gnu/store/nldcbaghx031b799mq9bdh8l00hg4fz6-grub-image.png.drv' failed with exit code 1
cannot build derivation `/gnu/store/sqwij2775lnlaal4jrv16hys5wjss5az-grub.cfg.drv': 1 dependencies couldn't be built
guix system: error: build failed: build of `/gnu/store/sqwij2775lnlaal4jrv16hys5wjss5az-grub.cfg.drv' failed
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