Add some options as safe, based on forum.v.o search.

This commit add some options as safe, based on a search
of issues on the forum.

Additions are:
- ffmpeg-pp-q (prosprocess quality)
- ffmpeg skiploopfilter (speed)
Signed-off-by: Laurent Aimar <fenrir@videolan.org>

modules/codec/avcodec/avcodec.c

@@ -123,6 +123,7 @@ vlc_module_begin ()
         change_integer_range( 0, 2 )
     add_integer ( "ffmpeg-skiploopfilter", 0, NULL, SKIPLOOPF_TEXT,
                   SKIPLOOPF_LONGTEXT, true )
+        change_safe ()
         change_integer_list( nloopf_list, nloopf_list_text, NULL )
 
     add_integer( "ffmpeg-debug", 0, NULL, DEBUG_TEXT, DEBUG_LONGTEXT,

modules/video_filter/postproc.c

@@ -85,6 +85,7 @@ vlc_module_begin ()
     add_integer_with_range( FILTER_PREFIX "q", PP_QUALITY_MAX, 0,
                             PP_QUALITY_MAX, NULL, Q_TEXT, Q_LONGTEXT, false )
         add_deprecated_alias( "ffmpeg-pp-q" )
+        change_safe()
     add_string( FILTER_PREFIX "name", "default", NULL, NAME_TEXT,
                 NAME_LONGTEXT, true )
         add_deprecated_alias( "ffmpeg-pp-name" )