[UR][CMake] Don't try to install UMF if using external UMF

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>

Author: sarnex

unified-runtime/source/common/CMakeLists.txt

@@ -124,7 +124,9 @@ target_sources(ur_umf INTERFACE
 
 add_library(${PROJECT_NAME}::umf ALIAS ur_umf)
 
-target_link_libraries(ur_umf INTERFACE
-    umf::umf
-    umf::headers
-)
+if(NOT UR_USE_EXTERNAL_UMF)
+   target_link_libraries(ur_umf INTERFACE
+       umf::umf
+       umf::headers
+   )
+endif()