[AC21.5] Latest mercurial code does not compile...

[Aidan Kehoe]

 Ar an séiú lá de mí Méan Fómhair, scríobh Stephen J. Turnbull: 

 > APPROVE COMMIT 21.5
 > 
 > Attached patch fixes the build.
 > 
 > "Obviously correct"; those enum constants have not been defined in
 > non-Mule builds since before r428.

Thanks, Stephen!

-- 
‘Iodine deficiency was endemic in parts of the UK until, through what has been
described as “an unplanned and accidental public health triumph”, iodine was
added to cattle feed to improve milk production in the 1930s.’
(EN Pearce, Lancet, June 2011)