netkit-telnet: Add to generate telnetlogin.

* Add oe_runmake line for telnetlogin to make the telnetlogin
folder to be built.
* Add FILES_${PN} line to let ${libdir}/telnetlogin to be
included in netkit-telnet package.
* Customize "install -D -m 4750 ${B}/telnetlogin/telnetlogin
${D}/${libdir}/telnetlogin" to let the telnetlogin to be
installed under /usr/lib64 on 64bit system.

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>