[UR] disable hwloc support for UMF (#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]>

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)
@@ -113,20 +116,22 @@ if(SYCL_PI_UR_USE_FETCH_CONTENT)
   endfunction()
 
   set(UNIFIED_RUNTIME_REPO "https://github.com/oneapi-src/unified-runtime.git")
-  # commit b7b0c8b3d17aa7d511c67ec219d58091d07cfa60
-  # Merge: 2baf0951 5b8936da
+  # commit a985a81dc9ba8adfcc8b54e35ad287e97766fb3e
+  # Merge: b7b0c8b3 f772f907
   # Author: Piotr Balcer <[email protected]>
-  # Date:   Fri Jul 26 15:48:04 2024 +0200
-  #     Merge pull request #1903 from kswiecicki/umf-version-bump
-  #     Bump UMF version again
-  set(UNIFIED_RUNTIME_TAG b7b0c8b3d17aa7d511c67ec219d58091d07cfa60)
+  # Date:   Mon Jul 29 09:11:29 2024 +0200
+  #     Merge pull request #1905 from igchor/umf_hwloc_disable
+  #     Bump UMF version to allow disabling hwloc
+  set(UNIFIED_RUNTIME_TAG a985a81dc9ba8adfcc8b54e35ad287e97766fb3e)
 
   set(UMF_BUILD_EXAMPLES OFF CACHE INTERNAL "EXAMPLES")
   # Due to the use of dependentloadflag and no installer for UMF and hwloc we need
   # to link statically on windows
   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