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

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

sycl/cmake/modules/FetchUnifiedRuntime.cmake

@@ -425,7 +425,9 @@ if(CMAKE_SYSTEM_NAME STREQUAL Windows)
   endif()
 endif()
 
-install(TARGETS umf
-  LIBRARY DESTINATION "lib${LLVM_LIBDIR_SUFFIX}" COMPONENT unified-memory-framework
-  ARCHIVE DESTINATION "lib${LLVM_LIBDIR_SUFFIX}" COMPONENT unified-memory-framework
-  RUNTIME DESTINATION "bin" COMPONENT unified-memory-framework)
+if(NOT UR_USE_EXTERNAL_UMF)
+  install(TARGETS umf
+    LIBRARY DESTINATION "lib${LLVM_LIBDIR_SUFFIX}" COMPONENT unified-memory-framework
+    ARCHIVE DESTINATION "lib${LLVM_LIBDIR_SUFFIX}" COMPONENT unified-memory-framework
+    RUNTIME DESTINATION "bin" COMPONENT unified-memory-framework)
+endif()