Interfaces: Remove NV_EXTENSIONS from two more headers.

This also fixes some cpp files that uncover issues when building
with the flags turned off.

StandAlone/ResourceLimits.cpp

@@ -125,7 +125,6 @@ const TBuiltInResource DefaultTBuiltInResource = {
     /* .MaxCullDistances = */ 8,
     /* .MaxCombinedClipAndCullDistances = */ 8,
     /* .MaxSamples = */ 4,
-#ifdef NV_EXTENSIONS
     /* .maxMeshOutputVerticesNV = */ 256,
     /* .maxMeshOutputPrimitivesNV = */ 512,
     /* .maxMeshWorkGroupSizeX_NV = */ 32,
@@ -135,7 +134,6 @@ const TBuiltInResource DefaultTBuiltInResource = {
     /* .maxTaskWorkGroupSizeY_NV = */ 1,
     /* .maxTaskWorkGroupSizeZ_NV = */ 1,
     /* .maxMeshViewCountNV = */ 4,
-#endif
 
     /* .limits = */ {
         /* .nonInductiveForLoops = */ 1,