Include <algorithm> for std::min, std::max
Add more detail to previous ChangeLog entry
Add /FS flag (msvc) for parallel builds
Allow -DNO_GET_ENVIRONMENT to avoid GetEnvironmentVariable

If NO_GET_ENVIRONMENT is #defined at compile time on Windows, do not
call GetEnvironmentVariable.  QUtil::get_env will always return
false.  This option is not available through configure.  This was
added to support a specific user's requirements to avoid calling
GetEnvironmentVariable from the Windows API.  Nothing in qpdf outside
the test coverage system in qtest relies on QUtil::get_env.