#3 Win32 port minor patch

[Jan Michael Ibanez]

This patch allows the GSimpletron source to be run
successfully under Win32. Tested under GNU/MinGW 2.96;
YMMV with other Win32 compilers.

Originally, the source out-of-the-box compiles ok under
the GNU/MinGW compiler, but fails to execute any test
SML file properly. This patch corrects a minor
difference between the Linux libc implementation and
the MSVC library implementation of certain I/O functions.

[Jan Michael Ibanez]

patch for v0.1; port to Win32 via GNU/MinGW