science/libxc: Add NATIVE option

... to have no native optimizations by default.
Otherwise libxc caused illegal instruction errors in science/sirius.

science/libxc/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	libxc
 DISTVERSION=	6.0.0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	science
 MASTER_SITES=	https://www.tddft.org/programs/${PORTNAME}/down/${DISTVERSION}/
 
@@ -18,6 +18,10 @@ TEST_DEPENDS=	bash:shells/bash
 CMAKE_ON=	BUILD_SHARED_LIBS ENABLE_FORTRAN ENABLE_PYTHON
 CMAKE_OFF=	BUILD_TESTING
 
+OPTIONS_DEFINE=		NATIVE
+
+NATIVE_CMAKE_BOOL=	ENABLE_XHOST
+
 pre-configure:
 	${REINPLACE_CMD} -e 's|$${CMAKE_INSTALL_LIBDIR}/pylibxc$$|${PYTHONPREFIX_SITELIBDIR}/pylibxc|'	\
 		-e 's|$${CMAKE_INSTALL_PREFIX}/$${CMAKE_INSTALL_LIBDIR}/pylibxc/|${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/pylibxc/|'\