Disable /analyze for the libexif and yasm projects to hack around internal compiler errors

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

Also fix a typo in libexif's README.chromium


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

Cr-Original-Commit-Position: refs/heads/master@{#302381}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5fb6274c6cd7d57421799bf7ac90991fbcbd7d22
2 files changed