From: Jory A. Pratt <anarchy@gentoo.org>

Fix member not declared in this class for musl compilation
https://bugs.gentoo.org/show_bug.cgi?id=607562

diff --git a/mozilla-config.h.in b/mozilla-config.h.in
--- a/mozilla-config.h.in
+++ b/mozilla-config.h.in
@@ -49,17 +49,17 @@
 
 /*
  * Force-include hunspell_alloc_hooks.h and hunspell_fopen_hooks.h for hunspell,
  * so that we don't need to modify them directly.
  *
  * HUNSPELL_STATIC is defined in extensions/spellcheck/hunspell/src/Makefile.in,
  * unless --enable-system-hunspell is defined.
  */
-#if defined(HUNSPELL_STATIC)
+#if 0
 #include "hunspell_alloc_hooks.h"
 #include "hunspell_fopen_hooks.h"
 #endif
 
 /*
  * Force-include sdkdecls.h for building the chromium sandbox code.
  *
  * CHROMIUM_SANDBOX_BUILD is defined in security/sandbox/moz.build.