[issue17845] Clarify successful build message

[Éric Araujo]

Éric Araujo added the comment:

Brett: You’re right, too bad.

Harrison: “third-party packages” may be ambiguous (Python distributions vs. system dependencies), and “required” may conflict with “optional”.

I propose:

Some optional modules were not built because of missing system files:
...
Python interpreter built successfully!

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<http://bugs.python.org/issue17845>
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