Fix CXX flags don't have -g

rocblas.spec

@@ -154,7 +154,7 @@ do
 	   -DCMAKE_INSTALL_LIBDIR=$ROCM_LIB \
 	   -DCMAKE_INSTALL_BINDIR=$ROCM_BIN \
 %if %{compat_build}
-	   -DCMAKE_CXX_FLAGS="--rocm-device-lib-path=%{_prefix}/lib/clang/%{maj_ver}/amdgcn/bitcode" \
+	   -DCMAKE_CXX_FLAGS="$CXXFLAGS --rocm-device-lib-path=%{_prefix}/lib/clang/%{maj_ver}/amdgcn/bitcode" \
 %endif
 	   -DBUILD_CLIENTS_BENCHMARKS=%{build_test} \
 	   -DBUILD_CLIENTS_TESTS=%{build_test} \