GDL: Drop placement patches
GDL: Fix macro name with upstream libgdltypebuiltins
Merge upstream GDL 0.7.8 changes
Dockable dialogs: Allow in-dock dialogs to be expanded even if there's no "slack".
Dockable dialogs patch applied (https://sourceforge.net/tracker/?func=detail&atid=604308&aid=1688508&group_id=93438)