Web: Turn off bracket-style attributes, reflection, and IO mapping.

glslang/MachineIndependent/iomapper.h

@@ -33,6 +33,8 @@
 // POSSIBILITY OF SUCH DAMAGE.
 //
 
+#ifndef GLSLANG_WEB
+
 #ifndef _IOMAPPER_INCLUDED
 #define _IOMAPPER_INCLUDED
 
@@ -293,3 +295,5 @@ public:
 } // end namespace glslang
 
 #endif // _IOMAPPER_INCLUDED
+
+#endif //  GLSLANG_WEB