[tex-live] xdvi and uint32_t

[Karl Berry]

After Olaf's latest updates (I guess it was), xdvik failed to build for
me, complaining about "duplicate unsigned" at the definition for
uint32_t in stdint.h.  

Turns out this is because the old autoconf we are using does not look in
stdint.h for the type, so was considering it unsigned, so did a #define
of uint32_t to unsigned long.

I changed our acgeneral.m4 to look in stdint.h if stdint.h is present --
Olaf, please grab that change for your private source.

Thanks,
k