Fix formatting of the local time zone when DST is in effect.

We must add DST offset manually as wxGetTimeZone() doesn't take DST into
account.

This fixes the handling of "%z" in format strings.

Closes #15250.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74242 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Restore case-insensitivity for file name matching under Windows.

This was broken by the changes of r73790, see #3432. Fix this by converting
both the file name and the wildcard mask to the upper case before checking
whether the former matches the latter.

Closes #15243.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74243 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Document that wxDC::FloodFill() is not implemented under wxOSX.

wxOSX uses wxGCDC for its wxDC functionality and wxGCDC doesn't implement this
operation, even not using the horribly inefficient wxGTK fallback.

See #15151.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74244 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775