[Dovecot] 2.0.12 ipwd.c does not compile under solaris

[Joseph Tam]

> From: Roger Fujii <rmf at lookhere.com>
>
> the new src/lib/ipwd.c introduced in 2.0.12 no longer compiles on
> solaris.   Under solaris,
> the *_r routines doesn't pass in result as the last parameter and return
> errno - it just returns result.
> obviously a job for configure.....

This was solved several Emails back about forcing the use of POSIX threading
models (a workaround path is provided):

 	http://www.dovecot.org/list/dovecot/2011-April/058602.html

Joseph Tam <jtam.home at gmail.com>