[Bug 1135152] user: Current not implemented on linux/amd64

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1135152

--- Comment #3 from Vincent Batts  ---
"""
os/user relies on cgo, and cgo is disabled for cross compiling,
thus this is expected.

if you use os/user, you must compile natively on OS X.

even if we enable cross compilation cgo support, I doubt everybody have
a working OS X cross toolchain on their linux machine.

"""
Upstream issue closed as WorkingAsIntended.