[PATCH]: Add CUPS.

[Ricardo Wurmus]

Hi Guix,

attached is a patch that adds a package recipe for CUPS.

There are a couple of problems with this package, one of which is that
the test suite is failing for some reason.  I have not been able to
figure out why the "cupsFileFind" test fails, so I disabled the tests.

I'm also not sure if creating two outputs "out" and "include" is
correct.  To build OpenJDK with IcedTea I need to have both the library
output and the include files and after splitting the outputs this worked
fine.

Finally, I have not actually tried to use CUPS at all, because I only
really need the libs and headers to build OpenJDK.

Best,
Ricardo

0001-gnu-Add-CUPS.patch
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