I ran src/tools/mark_pgdllimport.pl and it detected a few new global
variables with missing markings. See attached patch. Please point out
if any of these should not be marked or if they are special cases in
some other way. I'm Cc'ing various people involved with that new code.
Btw., this new variable in memutils.h
extern dsa_area *area;
could probably do with a less generic name?