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VC++ hits internal compiler errors on a source file in each of yasm and
libexif. This halts the build and prevents full analysis. Therefore this
change disables /analyze for those two projects, to increase total
coverage.

Also fix a typo in libexif's README.chromium

BUG=427616

Review URL: https://codereview.chromium.org/657883003

Cr-Commit-Position: refs/heads/master@{#302381}