ffmpeg: postproc's configure option have changed in the new version

multimedia/ffmpeg/ffmpeg.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../ffmpeg/ffmpeg.conf
-# Copyright (C) 2006 The OpenSDE Project
+# Copyright (C) 2006 - 2008 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2003 Clifford Wolf
 #
@@ -38,7 +38,7 @@ if pkginstalled libogg ; then
 fi
 
 # MMX optimizations currently don't compile (version 0.4.8)
-var_append confopt " " "--enable-gpl --enable-shared --enable-pp"
+var_append confopt " " "--enable-gpl --enable-shared --enable-postproc"
 
 # Shared objects should go in libdir as well.
 var_append confopt " " "--shlibdir=$libdir"