Remove the ${libdir}/gtk-2.0/include from its gdk-2.0.pc because the directory
does not exist, since we have moved it to ${includedir}/gtk-2.0. Bump the
PORTREVISION because it sometimes caused GCC crash. It's fixed in newer GCC,
but the fix is part of GPL3 that can't be merged into base system's GCC.

PR: ports/168004
Submitted by: Makoto Kishimoto <ksmakoto@dd.iij4u.or.jp>