gst-ffmpeg: fix libav config error for ppc

Pass --cpu to libav config when we're building ppc, or else there are
errors like:

    You need a compiler that supports {} in AltiVec vector declarations.

Also patch libav configure to have knowledge of more ppc CPUs.

(From OE-Core rev: a825781fc822f4630bc29906ca1ca79b8fad4836)

Signed-off-by: Jesse Zhang <sen.zhang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/gstreamer/gst-ffmpeg-0.10.13/libav_e5500.patch

@@ -0,0 +1,19 @@
+libav: Add configs for ppc e5500
+
+Upstream-Status: Pending
+
+Signed-off-by: Jesse Zhang <sen.zhang@windriver.com>
+
+--- gst-ffmpeg-0.10.13/gst-libs/ext/libav/configure	2013-06-20 05:18:36.073104964 -0400
++++ gst-ffmpeg-0.10.13/gst-libs/ext/libav/configure	2013-06-20 05:18:38.269104150 -0400
+@@ -2222,6 +2222,10 @@
+             cpuflags="-mcpu=8540 -mhard-float"
+             disable altivec
+         ;;
++        e5500)
++            cpuflags="-mcpu=e5500 -mhard-float"
++            disable altivec
++        ;;
+     esac
+ 
+ elif enabled x86; then

meta/recipes-multimedia/gstreamer/gst-ffmpeg_0.10.13.bb

@@ -21,6 +21,7 @@ SRC_URI = "http://gstreamer.freedesktop.org/src/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://configure-fix.patch \
            file://h264_qpel_mmx.patch \
            file://libav_e500mc.patch \
+           file://libav_e5500.patch \
 "
 
 SRC_URI[md5sum] = "7f5beacaf1312db2db30a026b36888c4"
@@ -31,7 +32,11 @@ PR = "r4"
 GSTREAMER_DEBUG ?= "--disable-debug"
 
 FFMPEG_EXTRA_CONFIGURE = "--with-ffmpeg-extra-configure"
-FFMPEG_EXTRA_CONFIGURE_COMMON_ARG = "--target-os=linux \
+# pass --cpu for powerpc. get cpu name by stripping "ppc" or "ppc64"
+# from DEFAULTTUNE
+FFMPEG_CPU_powerpc = "--cpu=${@d.getVar('DEFAULTTUNE')[3:]}"
+FFMPEG_CPU_powerpc64 = "--cpu=${@d.getVar('DEFAULTTUNE')[5:]}"
+FFMPEG_EXTRA_CONFIGURE_COMMON_ARG = "--target-os=linux ${FFMPEG_CPU} \
   --cc='${CC}' --as='${CC}' --ld='${CC}' --nm='${NM}' --ar='${AR}' \
   --ranlib='${RANLIB}' \
   ${GSTREAMER_DEBUG}"