CMake doesn't add this flag and it must be done manually. This
was not caught early as reconfiguring adds the flag for some
reason. It's to be determined if this is expected behavior. I hope
not, it's just confusing.

+ Add the `/EHsc` flag
+ remove CMAKE_BUILD_TYPE from configure step in helper script
+ remove useless Window definitions from qtwrapper that are defined
  in the parent CMakeLists.txt

Gitlab: #504
Change-Id: I8b03d81cae7ebed6a31cb69642db2f9f09a0c91b