removal of org-maybe-keyword-time-regexp

[Julien Cubizolles]

I'm using org-caldav (https://github.com/dengste/org-caldav/) to
synchronize the calendar on my Android phone and Org. Recently this
synchronization stopped working because org-caldav relies on
org-maybe-keyword-time-regexp that has been dropped from Org. As a
workaround, could this variable be reintroduced in org so as not to
break this very useful package ?

Julien.