bug#5459: Should url-util require url-vars?

[Lennart Borgman]

I got these error messages when calling url-retrieve (which is autloaded):

error in process filter:
url-http-content-length-after-change-function: Symbol's value as
variable is void: url-show-status
error in process filter: Symbol's value as variable is void: url-show-status
error in process filter:
url-http-content-length-after-change-function: Symbol's value as
variable is void: url-show-status
error in process filter: Symbol's value as variable is void: url-show-status
...

url-show-status is defined in url-vars.el.
url-http-content-length-after-change-function calls
url-display-percentage which needs url-show-status.

url-display-percentage is defined in url-util.el. Maybe this library
should require url-vars?