[Bug 41182] New: Don't export QT_QPA_PLATFORM

https://bugs.winehq.org/show_bug.cgi?id=41182

Bug ID: 41182
           Summary: Don't export QT_QPA_PLATFORM
           Product: Wine
           Version: 1.8.3
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Qt5 application can use different rendering backend, and environment variable
QT_QPA_PLATFORM is used to change default value.
On Linux system is usually set to "xcb" and wine forward this variable to
windows application, but then they will fail to start because the xcb backend
is not available in the emulated environment.
Wine should not set this variable in its environment.