Use internal sha1 in vc-bzr
* lisp/vc/vc-bzr.el (vc-bzr-sha1-program, sha1-program): Remove. These were only added in 24.1 when sha1.el was removed in favor of an internal sha1 implementation. Frankly, I can't see why the internal sha1 wasn't immediately used here. (vc-bzr-sha1): Use internal sha1. (Comments): Remove reference to abandoned upstream bug report that contains no extra information.
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