util-linux: Fix QA warnings about ALTERNATIVES

util-linux: Fix QA warnings about ALTERNATIVES

Previously, EXTRA_OECONF would be overwritten by EXTRA_OECONF_class-native
and EXTRA_OECONF_class-nativesdk.
As a result, some applications such as `last', `mesg' and `reset' didn't get
compiled.

The patch rewrote EXTRA_OECONF_class-native, EXTRA_OECONF_class-nativesdk
and EXTRA_OECONF variables to fix QA warnings.

usr/share/man/man1/last.1.util-linux does not exist
usr/share/man/man1/mesg.1.util-linux does not exist
usr/bin/last.util-linux does not exist
usr/bin/mesg.util-linux does not exist
bin/reset does not exist

(From OE-Core rev: 4cff0bd254667b145d765e1135f254c1916e2ee8)

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
[YOCTO #5338]
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>