[PATCH weston v2] compositor.c: do not leak option strings

[Ryo Munakata]

Hi.

This patch series is a version 2 of 'compositor.c: do not leak option strings'

1/2 extracts new functions from usual patterns in main.
2/2 fixes leaks of option strings 

Thanks.
-- 
Ryo Munakata <ryomnktml at gmail.com>