implement ends_with via strip_suffix

The ends_with function is essentially a simplified version
of strip_suffix, in which we throw away the stripped length.
Implementing it as an inline on top of strip_suffix has two
advantages:

  1. We save a bit of duplicated code.

  2. The suffix is typically a string literal, and we call
     strlen on it. By making the function inline, many
     compilers can replace the strlen call with a constant.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

strbuf.c

@@ -10,15 +10,6 @@ int starts_with(const char *str, const char *prefix)
 			return 0;
 }
 
-int ends_with(const char *str, const char *suffix)
-{
-	int len = strlen(str), suflen = strlen(suffix);
-	if (len < suflen)
-		return 0;
-	else
-		return !strcmp(str + len - suflen, suffix);
-}
-
 /*
  * Used as the default ->buf value, so that people can always assume
  * buf is non NULL and ->buf is NUL terminated even for a freshly