now in "gtk/capture_dlg.c" - so it doesn't need to include
<sys/sockio.h> on, for example, Solaris...
...but "gtk/capture_dlg.c" does need to include it.
"gtk/capture_dlg.c" also may need to include "snprintf.h", as it uses
"snprintf()".
svn path=/trunk/; revision=655