Bug #14789: Fix signal handling details

[Markus Elfring]

Hello,

I recommend to adjust a few implementation details for the source file 
"signal.c".
- Use of the data type "sig_atomic_t" for the variable "watchdog"
- Replacement of a function call "fprintf()" by  "write()"
http://bugs.winehq.org/show_bug.cgi?id=14789

Regards,
Markus
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