Window decoration fixes for Wayland.
Allow setting no decorations, and an attempt to allow setting no title bar.
closes #15553

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74977 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Revert the change to wxGTK build slave configure arguments.

Undo the temporary change of r74975 as it didn't help with fixing the problem
with the failing unit test.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74978 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix wrong common_samples.bkl include path in animate sample bakefile.

Surprisingly, the wrong path somehow worked all this time and still works in
some installation, but not all of them. Using the correct path shouldn't hurt
though.

Closes #15570.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74979 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775