[uClibc]BUFSIZ (to get TeX to compile)

[jsmaby at virgo.umeche.maine.edu]

I've just been building a complete uClibc workstation, and
ran into a problem building TeX.  After hacking on the thing
for hours (no compiler warnings were issued), I traced it
to BUFSIZ not being defined.  A quick google search suggests
this should be defined in ANSI C (in stdio.h).  Maybe this
could be defined as _STDIO_BUFSIZ.

By the way, TeX does compile fine with with CPPFLAGS="-DBUFSIZ=256".

-James Smaby