explicit TARGET check in sanitzer detection (#1120)

Author: zechigan

cmake/nanobind-config.cmake

@@ -459,7 +459,7 @@ function(nanobind_sanitizer_preload_env env_var)
     get_target_property(deps ${target} LINK_LIBRARIES)
     if(deps AND NOT deps STREQUAL "deps-NOTFOUND")
         foreach(dep ${deps})
-            if(NOT "${dep}" IN_LIST all_deps)
+            if(NOT "${dep}" IN_LIST all_deps AND TARGET "${dep}")
                 list(APPEND all_deps "${dep}")
             endif()
         endforeach()