multimedia/{lib,}x264: return to building with clang on powerpc64 elfv2

Head r359981 and r359994 reverted commits that caused clang to run in infinite loop, allocating all available memory and crashing the system.

multimedia/libx264/Makefile

@@ -3,7 +3,7 @@
 #
 # Updating notes: see multimedia/x264/Makefile.
 
-PORTREVISION=	0
+PORTREVISION=	1
 PKGNAMEPREFIX=	lib
 COMMENT=	H.264/MPEG-4 AVC Video Encoding (Library)
 MASTERDIR=	${.CURDIR}/../x264

multimedia/x264/Makefile

@@ -18,7 +18,7 @@
 
 PORTNAME=	x264
 PORTVERSION=	0.${X264_BUILD}.${X264_REV}
-PORTREVISION?=	0
+PORTREVISION?=	1
 CATEGORIES=	multimedia
 MASTER_SITES=	https://samples.mplayerhq.hu/yuv4mpeg2/:pgo
 DIST_SUBDIR=	x264
@@ -98,12 +98,6 @@ CONFIGURE_ARGS+=	--prefix="${PREFIX}" \
 			--extra-cflags="${CPPFLAGS} ${CFLAGS}" \
 			--extra-ldflags="${LDFLAGS}"
 
-.include <bsd.port.pre.mk>
-
-.if ${ARCH} == powerpc64
-USE_GCC=	yes
-.endif
-
 post-extract-PGO-on:
 	@${BZIP2_CMD} -dc ${DISTDIR}/${DIST_SUBDIR}/${Y4M_VIDEO_DISTFILE} \
 		>${WRKDIR}/${Y4M_VIDEO}
@@ -123,4 +117,4 @@ pre-build:
 	@(${RM} ${WRKSRC}/x264_config.h)
 .endif
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>