[bug#40989] [PATCH] gnu: supercollider: Enable SCClassLibrary library lookup.

[goodoldpaul]

Hi,
This patch fixes the error that prevents SuperCollider from starting. On 
Guix 229f4fa9522fb56b014ee9c0d8111e8fb6da764d and after having followed 
instructions from [0], the behavior is the following:

orang3@frastanato ~/code/guix$ guix environment --ad-hoc jack 
supercollider qjackctl
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 
100.0%
The following derivation will be built:
   /gnu/store/zzrq8li1plk9ll7yx48lhf27ffk5fvy0-profile.drv
The following profile hooks will be built:
   /gnu/store/jr02fwv31b0a07fcfkalgjjv1bq7ayx8-manual-database.drv
   /gnu/store/m4zril057cr1m55g7d56q9wp2mrbhhxg-fonts-dir.drv
   /gnu/store/mrfrb81vzcjxnj321fzi8nqkpvx6s5zw-info-dir.drv
   /gnu/store/spp41dzc0bmpbr9wvif8r4r2fs02zgfv-ca-certificate-bundle.drv
building CA certificate bundle...
building fonts directory...
building directory of Info manuals...
building database for manual pages...
building profile with 3 packages...

orang3@frastanato ~/code/guix [env]$ sclang
SC FFT global init: cosTable initialised.
compiling class library...
        Found 718 primitives.
        Compiling directory 
'/gnu/store/rrmvq9gzlvijliwlm35xml65jjqq8s29-supercollider-3.10.4/share/SuperCollider/Extensions'
        Compiling directory 
'/home/orang3/.local/share/SuperCollider/Extensions'
ERROR: There is a discrepancy.
numClassDeps 0   gNumClasses 82
sc3> s.boot
Library has not been compiled successfully.

The implemented solution is to hardcode SCClassLibrary's path into 
SuperCollider.

[0]: 
https://guix.gnu.org/manual/en/html_node/Base-Services.html#index-realtime

0001-gnu-supercollider-Enable-SCClassLibrary-library-look.patch
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