CC: tools/pkg-config: update to 0.29

CC: tools/pkg-config: update to 0.29
backport of r47300

Release announcement:
http://lists.freedesktop.org/archives/pkg-config/2015-September/001019.html

Drop patches, as they have been implemented upstream.

This also fixes a build problem in the glib configure script when the
user id is bigger than 2^21 - 1.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Signed-off-by: Felix Fietkau <nbd@openwrt.org> [fix OSX compatibility]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
SVN-Revision: 47608