firefox: nuke webrtc support on ppc64le

srcpkgs/firefox/template

@@ -91,6 +91,19 @@ do_build() {
 		echo "ac_add_options --disable-webrtc" >>.mozconfig
 	fi
 
+	# it seems mozilla has started catching up with google's webrtc
+	# and this newly involves introducing several megabytes of generated
+	# json junk that we just cannot maintain in-tree, additionally they
+	# have indicated that they will be re-generating these frequently
+	#
+	# it is unacceptable to keep a 7MB patch downstream, so disable it
+	#
+	# https://phabricator.services.mozilla.com/D134738
+	#
+	case "$XBPS_TARGET_MACHINE" in
+		ppc64le*) echo "ac_add_options --disable-webrtc" >>.mozconfig ;;
+	esac
+
 	if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
 		export LDFLAGS+=" -latomic"
 	fi