dev-libs/hyperscan: set release build type and respect O flags

CMAKE_BUILD_TYPE=Release disables -Werror flag which used to trigger
false positive error in GCC-10.

intel/hyperscan#239

Closes: https://bugs.gentoo.org/722802
Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Petr Vaněk <arkamar@atlas.cz>

dev-libs/hyperscan/hyperscan-5.2.1-r2.ebuild

@@ -30,12 +30,17 @@ PATCHES=(
 )
 
 src_prepare() {
+	# Respect user -O flags
+	sed -i '/set(OPT_CX*_FLAG/d' CMakeLists.txt || die
+
 	# upstream workaround
 	append-cxxflags -Wno-redundant-move
 	cmake_src_prepare
 }
 
 src_configure() {
+	CMAKE_BUILD_TYPE=Release
+
 	use cpu_flags_x86_ssse3 && append-flags -mssse3
 	use cpu_flags_x86_avx2  && append-flags -mavx2