* tui.c (tui_show_source): Don't access current_source_symtab, use
accessor function instead. Include source.h and symtab.h
* tuiDisassem.c (tuiShowDisassemAndUpdateSource,
tuiVerticalDisassemScroll): Use accessor functions for current
source line and symtab. Include source.h.
* tuiLayout.c (_extractDisplayStartAddr): Use accessor functions
for current source line and symtab. Include source.h.
* tuiWin.c (_makeVisibleWithNewHeight): Ditto.
* tuiSourceWin.c (tuiUpdateSourceWindowAsIs,
tuiHorizontalSourceScroll): Ditto.
* tuiSource.c (tuiVerticalSourceScroll): Ditto.