Disabled unknown pragma warning in GCC.

3rdparty/glsl-optimizer/include/c99_compat.h

@@ -66,7 +66,8 @@
 #  define _CRTRESTRICT
 #else
 // BK - STFU!
-#  pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#  pragma GCC diagnostic ignored "-Wunknown-pragmas" // for clang to disable GCC pragmas
+#  pragma GCC diagnostic ignored "-Wpragmas"         // for GCC to disable clang pragmas
 #  pragma GCC diagnostic ignored "-Wformat="
 #  pragma GCC diagnostic ignored "-Wformat-extra-args"
 #  pragma GCC diagnostic ignored "-Wignored-qualifiers"
@@ -74,7 +75,6 @@
 #  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
 #  pragma GCC diagnostic ignored "-Wreorder"
 #  pragma GCC diagnostic ignored "-Woverloaded-virtual"
-//#  pragma GCC diagnostic ignored "-Wparentheses-equality"
 #  pragma GCC diagnostic ignored "-Wsign-compare"
 #  pragma GCC diagnostic ignored "-Wunneeded-internal-declaration"
 #  pragma GCC diagnostic ignored "-Wunused-parameter"