mozjs_sys 0.67.1

System crate for the Mozilla SpiderMonkey JavaScript engine.
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diff --git a/mozjs/build/moz.configure/toolchain.configure b/mozjs/build/moz.configure/toolchain.configure
index a1e443019..613ce94aa 100755
--- a/mozjs/build/moz.configure/toolchain.configure
+++ b/mozjs/build/moz.configure/toolchain.configure
@@ -1199,8 +1199,14 @@ set_config('COLOR_CFLAGS', color_cflags)
 # hidden visibility.
 
 
-@depends(c_compiler, target)
-def libcxx_override_visibility(c_compiler, target):
+option(env='_LIBCPP_INLINE_VISIBILITY',
+       nargs=1,
+       help='Visibility of libc++ inlines')
+
+@depends('_LIBCPP_INLINE_VISIBILITY', c_compiler, target)
+def libcxx_override_visibility(value, c_compiler, target):
+    if len(value):
+        return value[0]
     if c_compiler.type == 'clang' and target.os == 'Android':
         return ''