[bug] crash when date exceeds 32-bits (x86_64)

[Scaevolus]

Steps to reproduce:
1. Run an x86_64 kernel
2. Run rxvt-unicode
3. sudo date -s "Sat Aug 25 01:00:00 MDT 2107"

Versions tested on:
8.1, 8.3, and cvs head from 2007.08.25

Backtrace:
Program received signal SIGABRT, Aborted.
#0 0x00002acc4cccf885 in raise () from /lib/libc.so.6
#1 0x00002acc4ccd0b3e in abort () from /lib/libc.so.6
#2 0x0000000000440359 in tw0::cb (this=0x5c7c, w=@0x5c7c) at iom.C:92
#3 0x000000000043fb2d in io_manager::loop () at callback.h:141
#4 0x00000000004168e7 in main (argc=1, argv=0x50) at rxvt.C:55

This bug would never be seen in a real environment, but if the fix is
trivial, it would still be nice to have.

Thanks for making such a great terminal emulator.
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