vlc: workaround an internal compiler with musl.

-O4 makes it crash, so that until somebody finds the real cause and reports
it upstream (in case it's not fixed) just change it -O2 to make it build.

srcpkgs/vlc/template

@@ -1,7 +1,7 @@
 # Template file for 'vlc'
 pkgname=vlc
 version=2.2.1
-revision=3
+revision=4
 build_style=gnu-configure
 configure_args="--disable-gme --disable-libtar --enable-jack
  --disable-lua --disable-live555 --disable-fluidsynth
@@ -40,20 +40,13 @@ build_options="notify opengl qt smb svg v4l2"
 build_options_default="v4l2"
 
 case "$XBPS_TARGET_MACHINE" in
-	i686-musl|x86_64-musl)
-		# XXX samba broken with musl
-		# Enable opengl by default on x86.
-		build_options_default+=" opengl"
-		configure_args+=" --enable-vdpau --enable-libva"
-		makedepends+=" libvdpau-devel libva-devel MesaLib-devel"
-		;;
-	i686|x86_64)
+	i686*|x86_64*)
 		# Enable opengl and samba by default on x86.
 		build_options_default+=" opengl smb"
 		configure_args+=" --enable-vdpau --enable-libva"
 		makedepends+=" libvdpau-devel libva-devel MesaLib-devel"
 		;;
-	armv[67]l)
+	armv[67]l*)
 		# XXX only for rpi
 		build_options_default+=" smb"
 		configure_args+=" --enable-omxil --enable-omxil-vout --enable-rpi-omxil"
@@ -79,6 +72,12 @@ pre_configure() {
 		-e 's,freetype/ftsynth.h,freetype2/ftsynth.h,' \
 		modules/text_renderer/freetype.c
 }
+pre_build() {
+	# -O[34] causes an internal compiler error with musl/gcc-4.9.2:
+	# internal compiler error: in vect_analyze_data_ref_accesses,
+	# at tree-vect-data-refs.c:2567
+	sed -i 's,-O4,-O2,g' -i modules/video_filter/Makefile
+}
 post_install() {
 	# Remove unused stuff
 	rm -f ${DESTDIR}/usr/lib/vlc/plugins/plugins.dat