rocPRIM changes to support reloctable ROCM installation (#118)
rocPRIM changes to support reloctable ROCM installation (#118)

- New mode of building is added "-r,--relocatable" which is used
  for ROCm stack installed in /opt/rocm-ver.
- Below CMAKE parameters are set/overwritten in above mode
  CMAKE_INSTALL_PREFIX
  CMAKE_MODULE_PATH
  CMAKE_PREFIX_PATH

Signed-off-by: Pruthvi Madugundu <dccb3aa96ea626a88045fc57f6cd01ed16370ddb@gmail.com>
ROCmSoftwarePlatform/rocPRIM,ROCmSoftwarePlatform/rocPRIM,ROCmSoftwarePlatform/rocPRIM