Include st.h when using st_* functions

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Original report by Anonymous.

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In MRI, st.h is included in intern.h which is included in ruby.h. However, we do not include st.h in Rubinius. Since st_* functions are used, st.h should be explicitly included.

Alternatively, I'd suggest not using st_* functions at all. They are very much an implementation detail of MRI.

The include of st.h is the only blocker for building the pg gem under Rubinius 1.9 mode:

https://gist.github.com/1489400

Thanks,
Brian

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Original comment by Charles Nutter (Bitbucket: headius, GitHub: headius).

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FWIW, JRuby's C ext support also does not include st.h, so consider this a second vote for avoiding its use.

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Original comment by Erik Michaels-Ober (Bitbucket: sferik, GitHub: sferik).

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I'll add a third vote!

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Original comment by Kyle Drake (Bitbucket: kyledrake, GitHub: kyledrake).

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Vote number four. This would be hugely helpful!

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Original comment by Anonymous.

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+1 I'd love to be able to use the pg gem on Rubinius.

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Original comment by George Bellos (Bitbucket: georgedev, GitHub: georgedev).

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another vote from me.

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Original comment by Michael Granger (Bitbucket: ged, GitHub: ged).

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I'm happy to accept a patch that replaces the use of st_* functions, and works under MRI (1.8.7 and 1.9.3), JRuby, and the latest Rubinius (in both 1.8 and 1.9 modes).

In the meantime, I'll add an include for st.h.

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Original comment by Anonymous.

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Any chance of a minor release with this fix? It'd be a nice Christmas present for Rubinius users :)

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Original comment by Michael Granger (Bitbucket: ged, GitHub: ged).

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Explicitly include the st.h file for interpreters that need it (fixes #95)