[issue1759169] clean up Solaris port and allow C99 extension modules

[Martin v. Löwis]

Martin v. Löwis added the comment:

I don't understand the problem. What Solaris version are you using?

Why do you want to remove _XOPEN_SOURCE? Solaris considers this as a
request for XPG 4.2 only _XOPEN_SOURCE_EXTENDED is defined, which it
shouldn't be on Solaris 10.

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