Patch to enable -Werror [take 2]

[David Edelsohn]

>>>>> Rainer Orth writes:

Rainer> On both Tru64 UNIX V4.0F and V5.1, <sys/types.h> has

Rainer> typedef unsigned char   uchar_t;
Rainer> typedef uchar_t         uchar;

	This probably is a common definition from OSF days.

David