cmake : fix building shared libs for clang (rocm) on windows (#3176)

CMakeLists.txt

@@ -445,7 +445,7 @@ if (LLAMA_ALL_WARNINGS)
 
 endif()
 
-if (MSVC)
+if (WIN32)
     add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
 
     if (BUILD_SHARED_LIBS)