Add unpatched bsdiff 4.3 to chrome/installer/mac/third_party/bsdiff

Add unpatched bsdiff 4.3 to chrome/installer/mac/third_party/bsdiff

I have non-algorithmic changes to bsdiff and bspatch, and they'll be easier
to review and easier to identify in the future if an unpatched copy is checked
in first.

The bsdiff and bspatch that you'll find elsewhere in the repository are
actually different forks of bsdiff, and aren't quite as appropriate for use in
the Mac binary patcher. The other copies are Mozilla's variant of bsdiff.

BUG=45017
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=49280

[TVL, 2010-06-09 16:58:58]

lg

http://codereview.chromium.org/2789003/diff/1/4
File chrome/installer/mac/third_party/bsdiff/README.chromium (right):

http://codereview.chromium.org/2789003/diff/1/4#newcode9
chrome/installer/mac/third_party/bsdiff/README.chromium:9: Binary diff/patch
utility
is it worth a comment here about why we have a copy here if it is also in other
places in the chromium tree?