Disable menu event test case in wxGTK buildbot slaves.

This test sporadically fails for unknown reason and I don't know what to do
about it, so disable it for now to let the test suite pass consistently and be
notifed about any new failures.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74028 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add conversions to/from long long to wxUniChar.

Allow conversions to/from long long and unsigned long long values in wxUniChar
for consistency with the other integral types.

Also make the code shorter by using helper wxDO_FOR_INT_TYPES() and
wxDO_FOR_CHAR_INT_TYPES() macros to avoid duplicating the same code for all of
the integral types and having to handle wchar_t (and wxLongLong_t now)
specially because sometimes we may need to overload on it and sometimes not.

Finally, add more tests to check that all the wxUniChar methods compile and
work with all the different types.

Closes #15206.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Delete the associated dialog in wxGTK wx{File,Dir}Button.

The code seemed to rely on Destroy() being called for deleting the dialog, but
it's actually not used for child windows, so do it in dtor instead.

Closes #15156.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74030 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Trigger wxLog auto-creation when getting old logger in wxLogChain ctor.

This ensures that a program that uses wxLogChain or one of the classes
deriving from it, such as wxLogWindow, can do it directly without worrying
about the standard logging being completely suppressed if the default log
target hadn't been instantiated yet.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74031 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775