linux(4): make getcwd(2) return ERANGE instead of ENOMEM

linux(4): make getcwd(2) return ERANGE instead of ENOMEM

For native FreeBSD binaries, the return value from __getcwd(2)
doesn't really matter, as the libc wrapper takes over and returns
the proper errno.

Approved by:	re (gjb)
PR:		kern/254120
Reported By:	Alex S <iwtcex@gmail.com>
Reviewed By:	kib
Sponsored By:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D29217

(cherry picked from commit 0dfbdd9fc269f0438ffcc31632d35234a90584ad)
(cherry picked from commit ab1a91d95872e59db3d476be4fefb0b58df3afc4)