Log Message:
lang/gccN-libs: Disable REQUIRES/PROVIDES analysis.

This is a stop-gap measure to work around:

PR pkg/58966: mk: REQUIRES/PROVIDES analysis is wrong for
self-libraries

It should be removed once the REQUIRES/PROVIDES analysis is fixed.

Since the REQUIRES/PROVIDES analysis is already done for the
underlying lang/gccN package, and the transformation from lang/gccN
to lang/gccN-libs is straightforward, disabling this check should be
reasonably low-risk -- currently the lang/gccN-libs packages are
outright broken and unusable with pkgtools/pkg_install.

This doesn't change the content of the package, only the metadata, so
no need for recursive revbump of dependent packages.