Changed warning string to use the WARNING flag.

Modules/FindCUDA.cmake

@@ -816,7 +816,7 @@ macro(CUDA_WRAP_SRCS cuda_target format generated_files)
     if(CUDA_VERSION VERSION_LESS "3.0")
       set(nvcc_flags ${nvcc_flags} --host-compilation C)
     else()
-      message( "WARNING: --host-compilation flag is deprecated in CUDA version >= 3.0.  Removing --host-compilation C flag" )
+      message(WARNING "--host-compilation flag is deprecated in CUDA version >= 3.0.  Removing --host-compilation C flag" )
     endif()
     set(CUDA_C_OR_CXX C)
   endif(CUDA_HOST_COMPILATION_CPP)