Fix several issues when building with solaris studio (bug #12961)

[github at samba.org]

New comment by douglasbagnall on Samba Github repository

https://github.com/samba-team/samba/pull/106#issuecomment-451052587
Comment:
Thanks @zehdeh.

We should close this because
1. we are forsaking github in favour of gitlab.
2. the pull request seems to picked up a large number of unrelated commits.
3. the upstream patch (samba bug 12961) no longer applies cleanly.