* go32-nat.c (go32_get_windows_version, print_mem, go32_sysinfo)

	* go32-nat.c (go32_get_windows_version, print_mem, go32_sysinfo)
	(read_memory_region, get_descriptor, display_descriptor)
	(go32_sldt, go32_sgdt, go32_sidt): New functions.
	(top-level): Include ctype.h, utsname.h, dos.h, and go32.h.  Ifdef
	away `disable' from dos.h, since breakpoint.h defines an enum
	member of the same name, and GCC 2.7.2 barfs.
	(_initialize_go32_nat): Provide new commands dos-sysinfo, dos-ldt,
	dos-gdt, and dos-idt, all of them in the "info" class