Exception in _putenv_s() under Wine

[olofson]

This happens right after the Olofson Arcade jingle, and when closing the game, under Wine:

Unhandled exception: 0xc0000417 in 32-bit code (0x7b83935c).
Register dump:
 CS:0023 SS:002b DS:002b ES:002b FS:0063 GS:006b
 EIP:7b83935c ESP:0071f9e4 EBP:0071fa68 EFLAGS:00200216(   - --  I   -A-P- )
 EAX:7b82694d EBX:7b8ae000 ECX:7b8392c0 EDX:00000000
 ESI:00000001 EDI:00000000
Stack dump:
0x0071f9e4:  00000025 0071fa18 7bc37347 7e8aab16
0x0071f9f4:  0071fa70 7e8d8d8d c0000417 00000001
0x0071fa04:  00000000 7b83935c 00000000 00000001
0x0071fa14:  7e8d8d8c 0071fa58 f75ea020 00000001
0x0071fa24:  7e8d8d8c 7e8aab80 7e8aab16 0071fa70
0x0071fa34:  00000000 00000000 0000000f 00000000
000c: sel=0067 base=00000000 limit=00000000 32-bit --x
Backtrace:
=>0 0x7b83935c in kernel32 (+0x2935c) (0x0071fa68)
  1 0x7e85c9d9 MSVCRT__invalid_parameter+0x78() in msvcrt (0x0071fab8)
  2 0x7e85bbd8 _putenv_s+0x107() in msvcrt (0x0071fb18)
  3 0x00449636 in kobord (+0x49635) (0x0071fc18)
0x7b83935c: addl    $12,%esp

[olofson]

This is in timegm() in pfile.cpp. Apparently, getenv("TZ") returns NULL.

_mkgmtime() is still missing in mingw, so I can't use that. Are we going to have to include a full implementation of timegm()...!?