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