Makefile: add support for $LIBDIR
Makefile: add support for $LIBDIR

Enable make to specify ${PREFIX}${LIBDIR} to install library
files to e.g. /usr/lib or /usr/lib64 depending on the arch.

Signed-off-by: Danny Al-Gaaf <473e39ac77cf392f0dd9bacde8409de76c14d006@bisect.de>

rcrane/kinetic-c,rcrane/kinetic-c,rcrane/kinetic-c,benmcclelland/kinetic-c,atomicobject/kinetic-c,Kinetic/kinetic-c,benmcclelland/kinetic-c,atomicobject/kinetic-c,rcrane/kinetic-c,chenchongli/kinetic-c,Kinetic/kinetic-c,Seagate/kinetic-c,kinjalcpatel/kinetic-c,Seagate/kinetic-c,chenchongli/kinetic-c,kinjalcpatel/kinetic-c,kinjalcpatel/kinetic-c,Kinetic/kinetic-c,benmcclelland/kinetic-c,atomicobject/kinetic-c,benmcclelland/kinetic-c,kinjalcpatel/kinetic-c,atomicobject/kinetic-c,benmcclelland/kinetic-c,Seagate/kinetic-c,chenchongli/kinetic-c,chenchongli/kinetic-c,Kinetic/kinetic-c,Seagate/kinetic-c