Hi guix,

This patch defines a linter detecting

  (arguments `(#:tests? #t et cetera))

in package definitions. This is unlikely to work well when
cross-compiling (some exceptions apply, e.g. take a look
at the 'fennel' package). Also, it is simply unnecessary
when compiling natively.

Fortunately, I failed to find a package that fails to cross-compile
due to this particular reason. (They failed to cross-compile due to
other reasons, or the 'check' target did nothing.)

I didn't try all packages flagged by the new linter, though.

On top of 75af43162e58a0b3fdc804963809ecb801fb81b7.

Greetings,
Maxime.