Upstream: No
Reason: mozjs60 miscompiles on musl if built with HAVE_THREAD_TLS_KEYWORD:
https://github.com/void-linux/void-packages/issues/2598
--- a/js/src/old-configure.in
+++ b/js/src/old-configure.in
@@ -1072,6 +1072,9 @@ if test "$ac_cv_thread_keyword" = yes; t
     *-android*|*-linuxandroid*)
       :
       ;;
+    *-musl*)
+      :
+      ;;
     *)
       AC_DEFINE(HAVE_THREAD_TLS_KEYWORD)
       ;;