sci-misc/stable-diffusion-cpp: restore rocm_use_hipcc

rocm_use_hipcc strips the unsupported cflags when calling hipcc, such as
-flto.

Refs: https://bugs.gentoo.org/983114
Signed-off-by: Gilles Dartiguelongue <gilles.dartiguelongue@esiee.org>

sci-misc/stable-diffusion-cpp/stable-diffusion-cpp-9999.ebuild

@@ -183,7 +183,7 @@ src_configure() {
 	fi
 
 	if use rocm; then
-		export HIPCXX="$(hipconfig -l)/clang" HIP_PATH="$(hipconfig -p)"
+		rocm_use_hipcc
 		mycmakeargs+=(
 			-DSD_HIPBLAS=ON
 			-DGPU_TARGETS=$(get_amdgpu_flags)