FindJNI: Append path only "if(EXISTS"

Modules/FindJNI.cmake

@@ -92,11 +92,15 @@ macro(java_append_library_directories _var)
         if(_path MATCHES "{libarch}")
             foreach(_libarch ${_java_libarch})
                 string(REPLACE "{libarch}" "${_libarch}" _newpath "${_path}")
+                if(EXISTS ${_newpath})
                     list(APPEND ${_var} "${_newpath}")
+                endif()
             endforeach()
         else()
+            if(EXISTS ${_path})
                 list(APPEND ${_var} "${_path}")
             endif()
+        endif()
     endforeach()
 endmacro()