coreutils: fix nativesdk install failure

coreutils: fix nativesdk install failure

The change "fix hostname conflict with other packages" moved the
hostname util to the list of base_bindir_progs, so do_install_append()
now expects hostname to have been built.

coreutils do_install_append() is shared between target and nativesdk
builds (though not used by native build, see comment) so hostname should
be enabled to build on both of them.

(From OE-Core rev: 57f1f5708306a6121b1172c5163c6566d5bcb89c)

Signed-off-by: S. Lockwood-Childs <sjl@vctlabs.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>