libdrm: skip the generic version check for the whole package

libdrm: skip the generic version check for the whole package

libdrm-tests ships DRM tools (modetest, proptest, ...) with no --version flag,
so the generic probe aborts with "No executables in the package provided
version" and fails CI. test-version.sh is shared by every subpackage built from
this directory and a non-zero exit fails it, so it must accept the whole family
(the libraries ship no executables either) -- hence libdrm*, not just libdrm-tests.

Signed-off-by: Alexandru Ardelean <redacted>