xbmc: remove unneeded patch

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

packages/mediacenter/xbmc/patches/xbmc-999.991-ffmpeg-prefix.patch

@@ -1,11 +0,0 @@
-diff -Naur xbmc-13.alpha-fc8358e/configure.in xbmc-13.alpha-fc8358e.patch/configure.in
---- xbmc-13.alpha-fc8358e/configure.in	2014-02-02 04:41:09.000000000 +0100
-+++ xbmc-13.alpha-fc8358e.patch/configure.in	2014-02-03 15:47:44.591058586 +0100
-@@ -2794,6 +2794,7 @@
-     CXXFLAGS="" \
-     LDFLAGS="$(echo "$LDFLAGS" | sed "s/-Wl,-Bsymbolic-functions//g")" \
-     ./configure \
-+      --prefix="${prefix}" \
-       --extra-cflags="$PASSED_CFLAGS $FFMPEG_EXTRACFLAGS" \
-       --disable-static \
-       `if test "$use_debug" = "no"; then echo --disable-debug; fi` \