pf: add note about changes ported from OpenBSD after 4.5

[emaste]

Summary

The last comprehensive sync with OpenBSD's pf corresponds to
OpenBSD 4.5, but many changes have been ported over since then.

[kp]

I don't expect this to make trolls stop trolling, but there's no harm in adding more detail to the history section either.

[gbe]

LGTM from manpages

share/man/man4/pf.4

 MAINTAINER=     [e-mail]
 COMMENT?=        H.264/MPEG-4 AVC Video Encoding (Front End CLI)
 
 LICENSE=        GPLv2
 LICENSE_FILE=   ${WRKSRC}/COPYING
 
 BUILD_DEPENDS=  yasm>=1.2.0:devel/yasm \
                 bash:shells/bash
+LIB_DEPENDS?=   libx264.so:multimedia/libx264
 
 X264_BUILD=     144
 X264_REV=       2533
 X264_COMMIT=    c8a773ebfca148ef04f5a60d42cbd7336af0baf6
 X264_GITVER=        ${X264_COMMIT:C/^(.......).*$/\1/g}
 X264_SNAPSHOT=  20150629
 
-USES?=                gmake pkgconfig tar:bzip2
+USES?=          pkgconfig
+USES+=          gmake localbase shebangfix tar:bzip2
 USE_LDCONFIG=   yes
 HAS_CONFIGURE=  yes
+SHEBANG_FILES=  configure
+PLIST_FILES?=   bin/x264
 
-OPTIONS_DEFINE?=        ASM DEBUG GCC GPAC LAVF PGO
-OPTIONS_DEFAULT?=       ASM GPAC
+OPTIONS_DEFINE+=        ASM DEBUG GCC GPAC LAVF PGO
+OPTIONS_DEFAULT+=       ASM GPAC
 
 GPAC_DESC=              MPEG-4 output support
 LAVF_DESC=                libav* format input/output support (requires FFmpeg)
 
 ASM_CONFIGURE_OFF=      --disable-asm
 
 DEBUG_CONFIGURE_ON=     --enable-debug
 DEBUG_CONFIGURE_OFF=    --enable-strip
 
+GCC_VARS=               USE_GCC=yes
+
 GPAC_CONFIGURE_OFF=     --disable-gpac
 GPAC_LIB_DEPENDS=       libgpac.so:multimedia/gpac-libgpac
 
 LAVF_CONFIGURE_OFF=     --disable-swscale --disable-lavf
 LAVF_LIB_DEPENDS=       libavcodec.so:multimedia/ffmpeg \
                         libavformat.so:multimedia/ffmpeg \
                         libavutil.so:multimedia/ffmpeg \
                         libswscale.so:multimedia/ffmpeg
 
-CONFIGURE_COMMON_ARGS=        --prefix=${PREFIX} \
-                        --extra-cflags="-I${LOCALBASE}/include" \
-                        --extra-ldflags="-L${LOCALBASE}/lib" \
-                        --disable-opencl \
-
-CONFIGURE_ARGS?=        ${CONFIGURE_COMMON_ARGS} \
-                        --system-libx264
-
-CFLAGS_armv6+=          -mcpu=arm1136jf-s
-
-.include <bsd.port.options.mk>
-
-.if ${SLAVE_PORT} == "no"
-PLIST_FILES+=   bin/x264
-LIB_DEPENDS+=   libx264.so:multimedia/libx264
-.endif
-
-.if ${PORT_OPTIONS:MGCC}
-USE_GCC=        yes
-.elif ${PORT_OPTIONS:MPGO}
-USE_GCC=        any
-.endif
-
-.if ${PORT_OPTIONS:MPGO}
+PGO_DISTFILES=                ${Y4M_VIDEO_DISTFILE}:pgo
+PGO_MAKE_ENV=                VIDS="${WRKDIR}/${Y4M_VIDEO}"
+PGO_ALL_TARGET=                fprofiled
 # y4m sample video
 Y4M_VIDEO=              example.y4m
 Y4M_VIDEO_DISTFILE=     example.y4m.bz2
+PGO_VARS=               USE_GCC=any \
+                        RESTRICTED="${Y4M_VIDEO_DISTFILE} file may not be mirrored" \
+                        RESTRICTED_FILES="${Y4M_VIDEO_DISTFILE}"
 
-DISTFILES+=        ${Y4M_VIDEO_DISTFILE}:pgo
-ALL_TARGET=        fprofiled
-MAKE_ENV+=        VIDS="${WRKDIR}/${Y4M_VIDEO}"
+CONFIGURE_ARGS?=        --system-libx264
+CONFIGURE_ARGS+=        --prefix="${PREFIX}" \
+                        --extra-cflags="${CPPFLAGS} ${CFLAGS}" \
+                        --extra-ldflags="${LDFLAGS}" \
+                        --disable-opencl \
 
-RESTRICTED=                ${Y4M_VIDEO_DISTFILE} file may not be mirrored
-RESTRICTED_FILES=       ${Y4M_VIDEO_DISTFILE}
-.endif
+CFLAGS_armv6+=                -mcpu=arm1136jf-s
 
-post-extract:
-.if ${PORT_OPTIONS:MPGO}
-        @( cd ${WRKDIR} && ${BZIP2_CMD} -dc ${DISTDIR}/${DIST_SUBDIR}/${Y4M_VIDEO_DISTFILE} > ${Y4M_VIDEO} )
-.endif
+post-extract-PGO-on:
+        @${BZIP2_CMD} -dc ${DISTDIR}/${DIST_SUBDIR}/${Y4M_VIDEO_DISTFILE} \
+                >${WRKDIR}/${Y4M_VIDEO}
 
 post-patch:
         @${REINPLACE_CMD} -e ' \
-                s|/bin/bash|${LOCALBASE}/bin/bash|; \
                 s|gpac_static|gpac|g' \
                 ${WRKSRC}/configure
         @${REINPLACE_CMD} -e ' \
                 s|bash|sh|; \
                 s|VER="x"|VER="${X264_REV} ${X264_GITVER}"|; \
                 s|VERSION=""|VERSION=" r${X264_REV} ${X264_GITVER}"|' \
                 ${WRKSRC}/version.sh
 
-.if ${SLAVE_PORT} == "no"
+.if !target(pre-build)
 pre-build:
         @(${RM} ${WRKSRC}/x264_config.h)
 .endif
 
 .include <bsd.port.mk>