PATCH: small fix to dfp.c

[Ben Elliston]

Hi Ian

> But I would like to understand where the typedef for uint32_t comes
> from.  I don't see it defined anywhere, and it is only used in
> dfp.c.  Have we now introduced an assumption that uint32_t is
> defined in a system header file?  Shouldn't we instead be checking
> HOST_BITS_PER_INT, etc.?

A good point; these types are defined only in C99, after all.

dfp.c includes decimal32.h (amongst others), which in turn includes
decNumber.h, decContext.h and gstdint.h.  The libdecnumber configury
generates gstdint.h using the config/stdint.m4 macros.

Perhaps it should be more obvious?

Ben