ffmpeg: update to ffmpeg-1.2.3, sync upstream patches

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/multimedia/ffmpeg/meta

@@ -21,7 +21,7 @@
 PKG_NAME="ffmpeg"
 PKG_VERSION="0.10.7"
 if [ "$XBMC" = "master" ]; then
-  PKG_VERSION="1.2.1"
+  PKG_VERSION="1.2.3"
 fi
 PKG_REV="1"
 PKG_ARCH="any"

packages/multimedia/ffmpeg/patches/1.2.1/ffmpeg-0038-backport-vaapi-return-early-from-ff_vaapi_render_picture-without-picture.patch

@@ -1,22 +0,0 @@
-Subject: [libav-devel] [PATCH 1/2] vaapi: return early from ff_vaapi_render_picture() without picture
-From: Janne Grunau janne-libav at jannau.net
-
-Fixes an assertion when called on uninitialized frame. Spotted after
-seeking in vlc. (backported from libav mailing list)
-
----
-
-diff --git a/libavcodec/vaapi.c b/libavcodec/vaapi.c
-index a220a9d..94959bf 100644
---- a/libavcodec/vaapi.c
-+++ b/libavcodec/vaapi.c
-@@ -46,6 +46,9 @@ int ff_vaapi_render_picture(struct vaapi_context *vactx, VASurfaceID surface)
-     VABufferID va_buffers[3];
-     unsigned int n_va_buffers = 0;
- 
-+    if (!vactx->pic_param_buf_id)
-+        return 0;
-+
-     vaUnmapBuffer(vactx->display, vactx->pic_param_buf_id);
-     va_buffers[n_va_buffers++] = vactx->pic_param_buf_id;
-