Clean up compile warnings

[mbheinen]

There are a lot of compile warnings, too many to list. Things like

Warning: Padding of 4 bytes required before ‘gb’ in COMMON ‘kgb’ at (1); reorder elements or use -fno-align-commons [-Walign-commons]
Warning: Initialization string at (1) was truncated to fit the variable (80/81)
Warning: Legacy Extension: Comma before i/o item list at (1)
Warning: Deleted feature: ASSIGN statement at (1)
warning: type of ‘p_ldardata’ does not match original declaration
warning: embedded ‘\0’ in format [-Wformat-contains-nul]
note: type mismatch in parameter 1
warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘Widget {aka struct _WidgetRec *}’