[O] Error in Context-sensitive word count in org mode (elisp)

[Ian Barton]

I have just found this very useful function in org hacks. Unfortunately, 
it doesn't seem to work with the latest org-mode. I get the following error:

Function definition void org-in-regexps-block-p
Grepping the org source code, it seems that this function no longer 
exists. What has it been replaced with?

Ian.