pkg-config 0.26 doesn't build without pkg-config installed

(cherry picked from commit 14c2ffe7)
Signed-off-by: Rafaël Carré <funman@videolan.org>

extras/tools/packages.mak

@@ -16,7 +16,7 @@ AUTOCONF_URL=$(GNU)/autoconf/autoconf-$(AUTOCONF_VERSION).tar.bz2
 AUTOMAKE_VERSION=1.11.1
 AUTOMAKE_URL=$(GNU)/automake/automake-$(AUTOMAKE_VERSION).tar.gz
 
-PKGCFG_VERSION=0.26
+PKGCFG_VERSION=0.23
 #PKGCFG_URL=http://downloads.videolan.org/pub/videolan/testing/contrib/pkg-config-$(PKGCFG_VERSION).tar.gz
 PKGCFG_URL=http://pkgconfig.freedesktop.org/releases/pkg-config-$(PKGCFG_VERSION).tar.gz