Merge pull request #3295 from NervanaSystems/tsocha/improve-cmake-grama

[CMAKE] Change CODEGEN error on windows to be more grammatically correct

CMakeLists.txt

@@ -540,7 +540,7 @@ if(NGRAPH_CODEGEN_ENABLE)
     elseif (NOT MSVS)
         include(cmake/external_llvm.cmake)
     else()
-        message(FATAL_ERROR "CODEGEN not support on Windows!")
+        message(FATAL_ERROR "CODEGEN is not supported on Windows!")
     endif()
 endif()