Move show_formats() to cmdutils.c.

Patch by: Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 13236 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.h

@@ -126,4 +126,10 @@ void show_version(void);
  */
 void show_license(void);
 
+/**
+ * Prints a listing containing all the formats supported by the
+ * program.
+ */
+void show_formats(void);
+
 #endif /* FFMPEG_CMDUTILS_H */