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

[anders musikka]

anders musikka <anders.musikka at gmail.com> added the comment:

Just wanted to chip in my $.02: 

Defining _XOPEN_SOURCE in the python headers causes problems for
Solaris. It also causes problems for Ubuntu Linux.

Because _XOPEN_SOURCE is defined, Python.h must included first in any
program under Ubuntu.

Perhaps the right fix is to just not define _XOPEN_SOURCE at all? Which
platforms disable important features when you don't define _XOPEN_SOURCE?

Sometimes there are standards which nobody follows. In such cases it can
be advantageous to "just do what everyone expects".

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nosy: +avl

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