nodejs-lts-10: use generic libatomic checks

srcpkgs/nodejs-lts-10/template

@@ -35,11 +35,12 @@ if [ "$XBPS_WORDSIZE" -ne "$XBPS_TARGET_WORDSIZE" ]; then
 	nocross="host and target must have the same pointer size"
 fi
 
-case "$XBPS_MACHINE" in
-	ppc64*) ;;
-	mips*|ppc*) hostmakedepends+=" libatomic-devel" ;;
-	*) ;;
-esac
+if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
+	makedepends+=" libatomic-devel"
+fi
+if [ "$XBPS_NO_ATOMIC8" ]; then
+	hostmakedepends+=" libatomic-devel"
+fi
 
 do_configure() {
 	local _args