Set CMAKE_FIND_ROOT_PATH_MODE_LIBRARY to BOTH too

This is to ensure that find_library can find libpi_level_zero
and libpi_opencl

Author: oleksandr-pavlyk

CMakeLists.txt

@@ -8,6 +8,7 @@ project(dpctl
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
 
 # Option to generate code coverage report using llvm-cov and lcov.
 option(DPCTL_GENERATE_COVERAGE