Undo the changes to a sample message catalog by "$Id" removal.

Revert the changes of r74602 to a binary file.

Closes #15563.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Call SetErrorMode() for all Windows applications, not just wxMSW ones.

This suppresses default system error message boxes when trying to load an
invalid DLL in wxGTK/Windows.

Closes #15559.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74974 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Change wxGTK build slave configuration to use built-in libpng.

This is an attempt to debug the failure of ImageTestCase::ScaleCompare() unit
test.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74975 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove assert from wxStringOperationsUtf8::DecIter().

The assert prevented decrementing end() iterator, which is a valid
operation.

Fixes #15566.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74976 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775