Address the following problem on DOS and Win 3.1, reported by Jim

Ahlstrom:

Arraymodule.c has static functions H_getitem and h_getitem, and a
few others which differ only in case.  These are a problem on
Windows 3.1, since a case-sensitive link causes Winsock to fail
(hey, it's not my fault).  Please convert H_etc to HH_etc etc.