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>

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