pretty.h: move has_non_ascii() declaration from commit.h

The function is defined in pretty.c, so this moves the declaration to
a more logical place.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.h

@@ -205,7 +205,6 @@ void free_commit_list(struct commit_list *list);
 
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 
-int has_non_ascii(const char *text);
 const char *logmsg_reencode(const struct commit *commit,
 			    char **commit_encoding,
 			    const char *output_encoding);