CMakeLists.txt cleanup

Add custom_commands to generate the HSA code objects
Remove the configure time file generation and add custom commands to
generate them at build time.

Change-Id: I167dd9befc6c73f32224935eaab74510922b26f4

test/MatrixTranspose_test/MatrixTranspose.cpp

@@ -114,8 +114,10 @@ int main() {
   float* TransposeMatrix;
   float* cpuTransposeMatrix;
 
+#if HIP_TEST
   float* gpuMatrix;
   float* gpuTransposeMatrix;
+#endif
 
   int i;
   int errors;