Move _taxonomy_access_grant_help_table() to taxonomy_access.admin.inc

While installaling the 6.X-1.3 version i've got an error due to a function used in

function taxonomy_access_help($path, $arg) {
of taxonomy_access.module

The undefined function called _taxonomy_access_grant_help_table

Per aps it's specific to my installation where per aps I have a uninstalled module (linked to help ?).

I've just commented out the function, but would it be possible to fix this :
- Include a dependency ?
- Don't use this function ?

In fact when installed with this error, all other function of tac don't seem to work.