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

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.....

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Roger Fujii<rmf@lookhere.com>