security/openssl: Fix build on MIPS

- gcc 4.2.1 on MIPS fails on -Werror

PR:		221620
Submitted by:	Fukang Chen <loader@FreeBSD.org>
MFH:		2017Q3

security/openssl/Makefile

@@ -57,7 +57,7 @@ SSL2_DESC=	SSLv2 protocol support
 SSL3_DESC=	SSLv3 protocol support
 ZLIB_DESC=	zlib compression support
 
-USES=		cpe perl5
+USES=		compiler cpe perl5
 USE_PERL5=	build
 MAKE_ARGS+=	WHOLE_ARCHIVE_FLAG=--whole-archive
 MAKE_ENV+=	LIBRPATH="${PREFIX}/lib" GREP_OPTIONS=
@@ -100,10 +100,12 @@ THREADS_CONFIGURE_OFF=	no-threads
 ZLIB_CONFIGURE_ON=	zlib zlib-dynamic
 ZLIB_CONFIGURE_OFF=	no-zlib no-zlib-dynamic
 
-CFLAGS+= -Werror -Qunused-arguments
-
 .include <bsd.port.pre.mk>
 
+.if ${CHOSEN_COMPILER_TYPE} != gcc && ${COMPILER_VERSION} != 42
+CFLAGS+= -Werror -Qunused-arguments
+.endif
+
 .if ${PREFIX} == /usr
 IGNORE=	the OpenSSL port can not be installed over the base version
 .endif