pkgconfig: Remove unneeded Requires.private
Fixes "pkg-config --exists xkbcomp" without installed pkg-config files for x11, xkbfile, and xproto >= 7.0.17.
xkbcomp works fine without those pkg-config files.
Fixes "pkg-config --exists xkbcomp" without installed pkg-config files for x11, xkbfile, and xproto >= 7.0.17.
xkbcomp works fine without those pkg-config files.