notmuch on Solaris

[Vladimir.Marek at oracle.com]

Hi,

In order to make notmuch compilable on Solaris, I had to make some
changes in the source code. Some changes are not yet ready to be
included to official tree, some I believe are. So I took first few to
see if I'm doing anything which could be accepted and hopefully decrease
number of local patches I have to hold. Comments are mostly welcome.

Thank you
-- 
	Vlad