Disable exceptions on Windows in all builds
Disable exceptions on Windows in all builds

Chromium previously had exceptions enabled in shared_library Win builds
for legacy reasons. That seems to have been copy-pasted into NaCL's
build/common.gypi.

Chromium disabled exceptions for all Windows builds in r285676; this does
the same for NaCL.

BUG=82385
NOTRY=true

Review URL: https://codereview.chromium.org/418383005

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13575 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client