add stdarg.h where missing

[Robert Lunnon]

Changelog:
server//event.c
server/object.c
server/mutex.c
server/semaphore.c
server/timer.c


Robert Lunnon <bobl at optusnet.com.au>
add header stdarg.h to avoid undeclared va_list


Notes about patch:
Patch affects five files in server subdir


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