If there is a package A (TUNE_PKGARCH) which is depended upon by B which
is MACHINE_ARCH and you build B for machine X, then Y, the user isn't
present in the sysroot for machine Y since the useradd code is never
triggered.
The change ensures the code does get triggered and the user is present.
[YOCTO 4739]
(From OE-Core rev: 5871337da49f8cd1eaf53f7cd0aacc026dc7bcdb)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>