cmake: Only define _HAS_EXCEPTIONS=0 for MSVC builds

[siren186]

cef/cmake/cef_variables.cmake.in

Line 502 in 8c6f8dd

_HAS_EXCEPTIONS=0 # Disable exceptions

This switch _HAS_EXCEPTIONS=0 will not disalbe exceptions, on the contrary, it brings some problems.
See:
pocoproject/poco#4668
nodejs/node-addon-api#85

[siren186]

See alse: Tencent/wcdb@077c061

[magreenblatt]

Chromium defines this value for MSVC builds (see here), and we need to match the Chromium configuration. If you think this is incorrect you can raise an issue with Chromium at https://crbug.com.

[magreenblatt]

More specifically, we could modify the CMake config to only define _HAS_EXCEPTIONS=0 when building with MSVC. However, MSVC is the only compiler that we currently support for building the CEF binary distribution on Windows.