[PATCH v2 00/10] Solaris support

[Blake Jones]

Thanks to Jani Nikula and Tomi Ollila for their comments.

Changes since last version:

- Add feature test for timegm(); move portable implementation of 
  timegm() into compat/, change libparse-time-string to pull in .o's
  from compat/.

- Include <stdio.h> in compat/check_*.c, to get definition of NULL.

- Explicitly define _POSIX_PTHREAD_SEMANTICS to 1 in compat.h.

- Call strchr() rather than index() in notmuch-config.c.

Blake