pkg-config: update to 0.29.1, fix build with gcc 6

pkg-config/.md5sum

@@ -1 +1 @@
-77f27dce7ef88d0634d0d6f90e03a77f  pkg-config-0.29.tar.gz
+f739a28cae4e0ca291f82d1d41ef107d  pkg-config-0.29.1.tar.gz

pkg-config/Pkgfile

@@ -3,7 +3,7 @@
 # Maintainer: CRUX System Team, core-ports at crux dot nu
 
 name=pkg-config
-version=0.29
+version=0.29.1
 release=1
 source=(http://pkgconfig.freedesktop.org/releases/$name-$version.tar.gz)
 
@@ -12,6 +12,7 @@ build() {
 
     ./configure --prefix=/usr \
                 --with-internal-glib \
+                --disable-compile-warnings \
                 --disable-host-tool
     make
     make DESTDIR=$PKG install