[UR] disable hwloc support for UMF (intel#14812)

Hwloc package is not avalable on certain distros (e.g. RHEL). To avoid
forcing users to install hwloc from sources, disable hwloc in UMF.

Based on:
oneapi-src/unified-memory-framework#642

---------

Co-authored-by: Piotr Balcer <[email protected]>
Co-authored-by: Dmitry Vodopyanov <[email protected]>

Author: 3 people

sycl/cmake/modules/FetchUnifiedRuntime.cmake

@@ -23,6 +23,9 @@ option(SYCL_PI_UR_USE_FETCH_CONTENT
 set(SYCL_PI_UR_SOURCE_DIR
   "" CACHE PATH "Path to root of Unified Runtime repository")
 
+option(SYCL_UMF_DISABLE_HWLOC
+  "Disable hwloc support in UMF" ON)
+
 # Here we override the defaults to disable building tests from unified-runtime
 set(UR_BUILD_EXAMPLES OFF CACHE BOOL "Build example applications." FORCE)
 set(UR_BUILD_TESTS OFF CACHE BOOL "Build unit tests." FORCE)
@@ -127,6 +130,8 @@ if(SYCL_PI_UR_USE_FETCH_CONTENT)
   if(WIN32)
     set(UMF_BUILD_SHARED_LIBRARY OFF CACHE INTERNAL "Build UMF shared library")
     set(UMF_LINK_HWLOC_STATICALLY ON CACHE INTERNAL "static HWLOC")
+  else()
+    set(UMF_DISABLE_HWLOC ${SYCL_UMF_DISABLE_HWLOC} CACHE INTERNAL "Disable hwloc for UMF")
   endif()
 
   fetch_adapter_source(level_zero