libcomps: clean up DEPENDS

libcomps: clean up DEPENDS

This recipe depends on zlib so add that explicitly.

Disable the tests and remove the dependency on libcheck, as we don't
install them.

Remove obsolete PYTHON_DESIRED assignment that isn't used anywhere.

Explicitly disable the documentation for now.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>