--enable-shared-pp should directly enable pp and not depend on --enable-pp.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@4830 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -494,7 +494,7 @@ for opt do
   ;;
   --enable-pp) pp="yes"
   ;;
-  --enable-shared-pp) shared_pp="yes"
+  --enable-shared-pp) pp="yes"; shared_pp="yes"
   ;;
   --enable-libgsm) libgsm="yes"
     extralibs="$extralibs -lgsm"