Remove various warning suppression pragmas

This requires a small change to to use strncpy() instead of strcpy(),
as well as change of include paths to not use "..". The other warnings
are just not being hit anymore.

glslang/MachineIndependent/glslang.y

@@ -110,13 +110,6 @@ using namespace glslang;
 
 %{
 
-/* windows only pragma */
-#ifdef _MSC_VER
-    #pragma warning(disable : 4065)
-    #pragma warning(disable : 4127)
-    #pragma warning(disable : 4244)
-#endif
-
 #define parseContext (*pParseContext)
 #define yyerror(context, msg) context->parserError(msg)
 

glslang/MachineIndependent/preprocessor/PpContext.h

@@ -86,11 +86,6 @@ NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "../ParseHelper.h"
 #include "PpTokens.h"
 
-/* windows only pragma */
-#ifdef _MSC_VER
-    #pragma warning(disable : 4127)
-#endif
-
 namespace glslang {
 
 class TPpToken {