SWDEV-366823 - Change pragma message to warning

File reorganization feature was implemented with backward compatibility
The backward compatibility support will be deprecated in future release.
Changed the #pragma message to #warning for a smooth transition

Change-Id: I85e14470cce0f3d7c14ecb40e0e9e8b29c977c9f

header_template.hpp.in

@@ -23,7 +23,12 @@
 #ifndef @include_guard@
 #define @include_guard@
 
+#if defined(__GNUC__)
+#warning "This file is deprecated. Use file from include path /opt/rocm-ver/include/ and prefix with roctracer"
+#else
 #pragma message("This file is deprecated. Use file from include path /opt/rocm-ver/include/ and prefix with roctracer")
+#endif
+
 @include_statements@
 
 #endif