Remove QNX Windows builds

We can't get those to work with the faster KVM based VMs, so disable
these builds for the time being.

Task-number: QTQAINFRA-1208
Change-Id: I74c19374d57e3f84d8f982b95aade4a779623228
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>

coin/platform_configs/qt5.txt

@@ -9,8 +9,6 @@ qtci-windows-7-x86-2        Android_ANY         x86         Mingw49     Packagin
 qtci-osx-10.11-x86_64       Android_ANY         armv7       GCC         Packaging Release DisableTests OpenGLES2
 qtci-osx-10.11-x86_64       Android_ANY         x86         GCC         Packaging Release DisableTests OpenGLES2
 qtci-linux-RHEL-6.6-x86_64  QNX_660             x86         GCC         Packaging Release DisableTests OpenGLES2 NoUseGoldLinker
-qtci-windows-7-x86-2        QNX_660             armv7       Mingw49     Packaging Release DisableTests OpenGLES2
-qtci-windows-7-x86-2        QNX_660             x86         Mingw49     Packaging Release DisableTests OpenGLES2
 # target arch is used here only for documentation the value is ignored
 qtci-windows-10-x86_64-7    WinRT_10            armv7       MSVC2015    Packaging DebugAndRelease Release DisableTests