Enable /Zc:StrictStrings on release builds

Enable /Zc:StrictStrings on release builds

This change gets most of Chromium building with /Zc:StrictStrings. It
turns the option on globally and defines _ATL_NO_HOSTING to avoid
pulling in mshtml.h (not StrictStrings compliant) and then turns it off
for installer_util_target which needs WbdemDisp.h which is also not
StrictStrings compliant.

Unfortunately that is not sufficient since there are two more source
files that need mshtml.h leading to these failures that are too painful
to fix:

ninja: Entering directory `out\Release'
[1/30 -   3% 0.000] CXX obj\remoting\host\win\remoting_host.rdp_client_window.obj
d:\src\chromium\src\remoting\host\win\rdp_client_window.cc(237): error C2065: 'CAxWindow2': undeclared identifier
[2/30 -   6% 0.000] CXX obj\remoting\host\win\remoting_unittests.rdp_client_unittest.obj
c:\src\depot_tools\win_toolchain\vs_files\win_sdk\include\um\mshtml.h(16561): error C2440: 'default argument': cannot convert from 'const wchar_t [1]' to 'BSTR'

It's not worth proceeding because no actual Chromium bugs were found.