sci-libs/rpp: fix compilation with USE=test

* fixes "patch -p1 failed with rpp-6.1.1-skip-install-license.patch"
* tests require opencv

Closes: https://bugs.gentoo.org/934981
Signed-off-by: Sv. Lockal <lockalsash@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/37322
Signed-off-by: Andrew Ammerlaan <andrewammerlaan@gentoo.org>

sci-libs/rpp/rpp-6.1.1.ebuild

@@ -29,7 +29,10 @@ DEPEND="${RDEPEND}"
 BDEPEND="
 	>=dev-build/cmake-3.22
 	>=dev-libs/half-1.12.0-r1
-	test? ( dev-cpp/gtest )
+	test? (
+		dev-cpp/gtest
+		media-libs/opencv:=
+	)
 "
 
 IUSE="cpu_flags_x86_avx2 cpu_flags_x86_fma3 cpu_flags_x86_f16c test"
@@ -54,7 +57,10 @@ src_prepare() {
 		-i CMakeLists.txt || die
 
 	cmake_src_prepare
-	use test && rcc_test_wrapper cmake_src_prepare
+	if use test; then
+		local PATCHES=()
+		rcc_test_wrapper cmake_src_prepare
+	fi
 }
 
 src_configure() {