Remove multilib hack leftover usrlib_LTLIBRARIES
Remove multilib hack leftover usrlib_LTLIBRARIES

This was added back in 437869fcc50a44ca95b7315bb1ed246707c39916 to
override libdir on multilib systems, this broken logic was long since
removed but the usrlib thing was left behind. Just use lib_LTLIBRARIES
as deity meant it.

GerHobbelt/POPT,GerHobbelt/POPT,GerHobbelt/POPT