100l: Revert removal of GPL check for libswscale.

libswscale still compiles GPL parts by default.

Originally committed as revision 17557 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -81,7 +81,7 @@ show_help(){
   echo "  --disable-ffplay         disable ffplay build"
   echo "  --disable-ffserver       disable ffserver build"
   echo "  --enable-postproc        enable GPLed postprocessing support [no]"
-  echo "  --enable-swscale         enable software scaler support [no]"
+  echo "  --enable-swscale         enable GPLed software scaler support [no]"
   echo "  --enable-avfilter        video filter support (replaces vhook) [no]"
   echo "  --enable-avfilter-lavf   video filters dependent on avformat [no]"
   echo "  --disable-vhook          disable video hooking support"
@@ -1684,6 +1684,7 @@ if ! enabled gpl; then
     die_gpl_disabled "libxvidcore"             libxvid
     die_gpl_disabled "FAAD2"                   libfaad2
     die_gpl_disabled "The X11 grabber"         x11grab
+    die_gpl_disabled "The software scaler"     swscale
 fi
 
 if ! enabled nonfree && enabled_any libamr_nb libamr_wb; then