Drop the timestamp caching because it doesn't seem useful.
Use gettimeofday() to obtain system time.
Add null checks to both contstructor and destructor.
Drop the flushing and set line buffering instead.
Remove weston_log_print(), it only wraps vfprintf anyways.
This is logging functionality for weston compositor.
It handles:
messages coming from libwayland-server from wl_log()
messages from weston itself, from weston_log()
Introduce --log option, to specify log file path on the command line.
When the path is incorrect, or on weston_log_file_destroy(), fall
back to stderr.
