syscall: change RLIM_INFINITY from 0xffffffffffffffff to -1
syscall: change RLIM_INFINITY from 0xffffffffffffffff to -1

For compatibility with the gc toolchain's syscall package.

Fixes golang/go#28665

Change-Id: Id26b3ac2f5750cd9065a1d710623a916e57afe41
Reviewed-on: https://go-review.googlesource.com/c/148697
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>

golang/gofrontend,golang/gofrontend,golang/gofrontend,golang/gofrontend