Fix errors due to disabled exceptions with cpp_winrt support

The winrt headers use exceptions so code using them must be compiled
with exceptions enabled. Otherwise one runs into compile errors with
mingw-w64 12.0.0 and GCC 14.2.0.

Change-Id: I216f65b260062ff2020f8a288ddda78c3e9fc3c9
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

src/plugins/platforms/direct2d/CMakeLists.txt

@@ -8,6 +8,7 @@
 qt_internal_add_plugin(QWindowsDirect2DIntegrationPlugin
     OUTPUT_NAME qdirect2d
     PLUGIN_TYPE platforms
+    EXCEPTIONS
     SOURCES
         ../windows/qtwindowsglobal.h
         ../windows/qwin10helpers.cpp ../windows/qwin10helpers.h

src/plugins/platforms/windows/CMakeLists.txt

@@ -9,6 +9,7 @@ qt_internal_add_plugin(QWindowsIntegrationPlugin
     OUTPUT_NAME qwindows
     PLUGIN_TYPE platforms
     DEFAULT_IF "windows" IN_LIST QT_QPA_PLATFORMS
+    EXCEPTIONS
     SOURCES
         main.cpp
         qtwindowsglobal.h