SWDEV-366831 - Revert "File reorg backward compatibility message changed to #error"

This reverts commit c86bd74c67.

Reason for revert: Need to wait for apps to make fixes first

Change-Id: I337a0b56d268093fc8689152002a6f8a8ceb258f

opencl/opencl-backward-compat.cmake

@@ -53,10 +53,10 @@ function(create_header_template)
 #ifndef @include_guard@
 #define @include_guard@
 
-#if defined(__GNUC__)
-#error \"This file is deprecated. Use file from include path /opt/rocm-ver/include/ and prefix with CL\"
-#else
+#if defined(_MSC_VER)
 #pragma message(\"This file is deprecated. Use file from include path /opt/rocm-ver/include/ and prefix with CL\")
+#elif defined(__GNUC__)
+#warning \"This file is deprecated. Use file from include path /opt/rocm-ver/include/ and prefix with CL\"
 #endif
 
 @include_statements@