#8 crashes on startup when creating new character on windows

[Rupert Aph]

3.4.3 source unmodified

hw:
fujitsu siemens lifebook e series
Intel core duo t2300 @1.66 GHz
1GB of ram
sw:
Microsoft Windows XP Professional v 2002, SP3
Microsoft Visual C++ 2005, Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Nethack binary v3.4.3

On startup, when trying to start a new game, after entering character name into editbox window, the game crashes with assertion failure:

((pmode & (~(_S_IREAD | _S_IWRITE))) == 0)
file: open.c
line: 161

Wrong file creation mask value (probably just copied from include/unixconf.h) defined in include/ntconf.h is passed to vc runtime. Correct definition in diff.

[Rupert Aph]

correct #define for FCMASK on windows xp