The keyboard focus was getting reset to the first widget any time a
widget changed validity, because the form wasn't updating priv->focus
when it should have.
Virtual device types can only have an ifname in the "Device" entry,
but the code was accidentally filling in the MAC address too if the
device currently existed (which then made the entry value invalid).
The nmtui development tree didn't use libtool, and the rules that
worked to install links in those Makefiles ended up causing the
libtool wrapper scripts to get installed here. Fix.
