Description: Fix "implicit declaration of function  [...]" compiler errors
 by declaring extern functions as found in `libmp3lame/id3tag.c`.
Author: Fabian Greffrath <fabian@debian.org>
Forwarded: https://sourceforge.net/p/lame/bugs/517/

--- a/frontend/parse.c
+++ b/frontend/parse.c
@@ -402,6 +402,12 @@ static int getIntValue(char const* token
 }
 
 #ifdef ID3TAGS_EXTENDED
+
+extern int
+id3tag_set_comment_ucs2(lame_t gfp, char const *lang, unsigned short const *desc, unsigned short const *text);
+extern int
+id3tag_set_fieldvalue_ucs2(lame_t gfp, const unsigned short *fieldvalue);
+
 static int
 set_id3v2tag(lame_global_flags* gfp, TextEncoding enc, int type, unsigned short const* str)
 {