libvpx: make this build in all platforms (build with -fPIC).

srcpkgs/libvpx/template

@@ -1,7 +1,7 @@
 # Template file for 'libvpx'
 pkgname=libvpx
 version=1.2.0
-revision=1
+revision=2
 wrksrc="${pkgname}-v${version}"
 hostmakedepends="which perl yasm"
 short_desc="The VP8 Codec"
@@ -18,6 +18,7 @@ do_configure() {
 		sed -e "s,generic-gnu,$XBPS_CROSS_TRIPLET," -i configure
 		_cross="--target=$XBPS_CROSS_TRIPLET"
 	fi
+	CFLAGS+=" -fPIC"
 
 	./configure --enable-vp8 --enable-runtime-cpu-detect --enable-shared \
 		--enable-postproc --enable-pic --disable-install-docs \