* environ.h (struct environ): Rename to ...

	(struct gdb_environ): ... this.
	(make_environ): Update prototype.
	(free_environ): Likewise.
	(init_environ): Likewise.
	(get_in_environ): Likewise.
	(set_in_environ): Likewise.
	(unset_in_environ): Likewise.
	(environ_vector): Likewise.
	* environ.c (make_environ): Replace "struct environ" with "struct
	gdb_environ".
	(free_environ): Likewise.
	(init_environ): Likewise.
	(environ_vector): Likewise.
	(get_in_environ): Likewise.
	(set_in_environ): Likewise.
	(unset_in_environ): Likewise.
	* infcmd.c (inferior_environ): Likewise.
	* inferior.h (inferior_environ): Likewise.