Revert "Rename libevent-host to libevent"

This reverts commit ef31fc6477e1424f507095d1478f21445d569a21.
It's now using unique_host_soname to use a different installed name,
but keeping the libevent module name.

Change-Id: I1cb6e8e670636089993054236b089da059629da1
1 file changed