Force the use of system as and ld. This makes building and using this

port consistent across installations and avoids confusing error modes
for users who may have others flavors of these tools earlier in PATH.

On the way, sort CONFIGURE_ARGS.

Triggered by:	glarkin

lang/gcc42/Makefile

@@ -53,14 +53,16 @@ WRKSRC=		${WRKDIR}/build
 TARGLIB=	${PREFIX}/lib/gcc${SUFFIX}
 LIBEXEC=	${PREFIX}/libexec/gcc${SUFFIX}
 GNU_CONFIGURE=	yes
-CONFIGURE_ARGS+=	--disable-nls \
-		--with-system-zlib \
-		--with-libiconv-prefix=${LOCALBASE} \
-		--with-gmp=${LOCALBASE} \
-		--program-suffix=${SUFFIX} \
+CONFIGURE_ARGS+=--disable-nls \
 		--libdir=${TARGLIB} \
 		--libexecdir=${LIBEXEC} \
-		--with-gxx-include-dir=${TARGLIB}/include/c++/
+		--program-suffix=${SUFFIX} \
+		--with-as=/usr/bin/as \
+		--with-gmp=${LOCALBASE} \
+		--with-gxx-include-dir=${TARGLIB}/include/c++/ \
+		--with-ld=/usr/bin/ld \
+		--with-libiconv-prefix=${LOCALBASE} \
+		--with-system-zlib
 MAKE_ARGS+=	MAKEINFOFLAGS="--no-split"
 ALL_TARGET=	bootstrap-lean
 USE_LDCONFIG=	${TARGLIB}