math/elpa: Fix build on 14; Disable building test code

-Werror caused -P unknown argument to become an error.
Reported this error to the elpa upstream.

Reported by:	fallout

math/elpa/Makefile

@@ -15,11 +15,14 @@ LICENSE_FILE_LGPL3=	${WRKSRC}/COPYING/lgpl.txt
 LIB_DEPENDS=	libopenblas.so:math/openblas
 
 USES=		compiler:c11 fortran gmake libtool localbase perl5 shebangfix
-SHEBANG_GLOB=	*.pl
-GNU_CONFIGURE=	yes
-CONFIGURE_ARGS=	--disable-avx --disable-avx2 --disable-static
 USE_LDCONFIG=	yes
 
+SHEBANG_GLOB=	*.pl
+
+GNU_CONFIGURE=	yes
+CONFIGURE_ARGS=	--disable-avx --disable-avx2 --disable-static \
+		--disable-c-tests
+
 INSTALL_TARGET=	install-strip
 
 BINARY_ALIAS=	make=gmake gcc=gcc${GCC_DEFAULT} g++=g++${GCC_DEFAULT} # build fails with clang: recursively calls cc
@@ -37,6 +40,9 @@ MPI_LIB_DEPENDS=		libmpich.so:net/mpich \
 
 PORTDOCS=	*
 
+post-patch: # workaround for: https://github.com/marekandreas/elpa/issues/6
+	@${FIND} ${WRKSRC} -name "*.mk" | ${XARGS} ${REINPLACE_CMD} -e 's|-Werror| |'
+
 .include <bsd.port.options.mk>
 
 .if ${PORT_OPTIONS:NSSE}