[bug#74059] [PATCH v1] gnu: Add guile-raylib

[arnaud . lechevallier]

Hello,

This my first attempt to make a more complex definition package for Guix.
I've targeted to build a package for a Guile bindings to the Raylib library.

Briefly, I built a variant of Raylib named raylib-with-extras (more recent than 
the current release from Guix).
It contains some extra files (API definition) to build the Guile bindings. 
Those files are not delivered in the current package definition for Raylib.
Maybe we can avoid a new variant and merge it inplace ?

For the guile-raylib itself, I've added an additional output `examples` to 
provide code samples.

I greatly appreciate a review for this definition package.

Best regards, Arnaud.

0001-PATCH-v1-gnu-Add-guile-raylib.patch
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