Hiprtc related libraries are duplicated when installed from build directory
This happens when cmake install libdir is set with lib64 as default and using hard code path "lib" for LIBRARY_DESTINATION
Replaced "lib" with cmake install libdir
Removed the default setting of libdir in source code and its should be controlled via build argument
Change-Id: Icac55eac9427a5088903d01942e6bfd5263a6fc0
Ranjith Ramakrishnan
ba04f95771