Fixed compiler warning on Linux resulting in build failures.

BUG=none
TEST=compiled on Linux
Review URL: https://codereview.appspot.com/7201056

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1797 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/preprocessor/ExpressionParser.cpp b/src/compiler/preprocessor/ExpressionParser.cpp
index dee6029..56bc28b 100644
--- a/src/compiler/preprocessor/ExpressionParser.cpp
+++ b/src/compiler/preprocessor/ExpressionParser.cpp
@@ -84,10 +84,12 @@
 // This file is auto-generated by generate_parser.sh. DO NOT EDIT!
 
 #if defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wpragmas"
 #pragma GCC diagnostic ignored "-Wunknown-pragmas"
 // Triggered by the auto-generated pplval variable.
 #pragma GCC diagnostic ignored "-Wuninitialized"
 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#pragma GCC diagnostic warning "-Wpragmas"
 #pragma GCC diagnostic warning "-Wunknown-pragmas"
 #elif defined(_MSC_VER)
 #pragma warning(disable: 4065 4701)