firefox: preliminary 32-bit ppc fixes

The xptcall code needs to be fixed for this to build and work.
This for now adds some preliminary changes to allow the rest of
it to build.

srcpkgs/firefox/template

@@ -16,7 +16,7 @@ checksum=78304cd58229e7103b56b34718aad051c9a4db30c266512a64f501ba58da7fbe
 lib32disabled=yes
 
 hostmakedepends="autoconf213 unzip zip pkg-config perl python3 yasm rust cargo
- llvm clang nodejs cbindgen python nasm"
+ llvm clang nodejs-lts-10 cbindgen python nasm"
 makedepends="nss-devel libjpeg-turbo-devel gtk+-devel gtk+3-devel icu-devel
  pixman-devel sqlite-devel libevent-devel libnotify-devel libvpx5-devel
  libXrender-devel libXcomposite-devel libSM-devel libXt-devel rust-std
@@ -36,7 +36,10 @@ case $XBPS_TARGET_MACHINE in
 		broken="required NEON extensions are not supported on armv6"
 		;;
 	ppc64*) ;;
-	ppc*) broken="ftbfs in several places" ;;
+	ppc*)
+		makedepends+=" libatomic-devel"
+		broken="xptcall bitrot"
+		;;
 esac
 
 # we need this because cargo verifies checksums of all files in vendor
@@ -83,6 +86,16 @@ do_build() {
 		;;
 	esac
 
+	# webrtc currently fails to build on 32-bit ppc...
+	# also need explicit libatomic
+	case "$XBPS_TARGET_MACHINE" in
+	ppc64*) ;;
+	ppc*)
+		echo "ac_add_options --disable-webrtc" >>.mozconfig
+		export LDFLAGS+=" -latomic"
+		;;
+	esac
+
 	if [ "$CROSS_BUILD" ]; then
 		BINDGEN_INCLUDE_FLAGS=$( $CPP -x c++ -v /dev/null -o /dev/null 2>&1 | \
 			sed -n '/#include <...> search starts here:/,/End of search list./p' | \