Set default host and target charsets in the DJGPP port.

	Set default host and target charsets in the DJGPP port.

	* config/djgpp/config.sed (am_cv_langinfo_codeset)
	(bash_cv_langinfo_codeset, ac_cv_header_nl_types_h): Set to "yes"
	in all configure scripts that define ac_cv_env_CPP_value.
	* go32-nat.c (dos_codepage, nl_langinfo): New functions.
	Include langinfo.h.
	* config/djgpp/nl_types.h: New file.
	* config/djgpp/langinfo.h: New file.
	* config/i386/go32.mh (MH_CFLAGS): Add $(srcdir)/config/djgpp.