Propagate ExternalData binary root to script config

Author: AnastaZIuk

cmake/vendor/ExternalData_config.cmake.in

@@ -2,6 +2,7 @@ set(ExternalData_OBJECT_STORES "@ExternalData_OBJECT_STORES@")
 set(ExternalData_URL_TEMPLATES "@ExternalData_URL_TEMPLATES@")
 set(ExternalData_TIMEOUT_INACTIVITY "@ExternalData_TIMEOUT_INACTIVITY@")
 set(ExternalData_TIMEOUT_ABSOLUTE "@ExternalData_TIMEOUT_ABSOLUTE@")
+set(ExternalData_BINARY_ROOT "@ExternalData_BINARY_ROOT@")
 set(ExternalData_NO_SYMLINKS "@ExternalData_NO_SYMLINKS@")
 set(ExternalData_LINK_MODE "@ExternalData_LINK_MODE@")
 set(ExternalData_STATE_ROOT "@ExternalData_STATE_ROOT@")