This was kinda ugly-but-necessary when added back in 2003 (commit
752cac72e2) but entirely redundant
since the "new" dependency generator in rpm >= 4.9.x with arbitrary
filtering support. The handful of packages using it can just as well
achieve the same (and more) without special hacks in rpm with:
%global __requires_exclude GLIBC_PRIVATE
%global __provides_exclude GLIBC_PRIVATE