test_cmp: do not use "diff -u" on platforms that lack one

diff --git a/utf8.h b/utf8.h
index b09687d500b89d4f3a0644fea8b1eff420e0748a..ebc4d2fa85113c971ab4c4eaa52537a688a03745 100644 (file)
--- a/utf8.h
+++ b/utf8.h
@@ -3,7 +3,6 @@
 
 typedef unsigned int ucs_char_t;  /* assuming 32bit int */
 
-ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p);
 int utf8_width(const char **start, size_t *remainder_p);
 int utf8_strwidth(const char *string);
 int is_utf8(const char *text);