Make gen_partprune_steps static

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: d1e2cac5ff7eaf3e9feac419205b3e08052be961
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-05-09T13:40:25Z
Releases: 11.0
Make gen_partprune_steps static

There's no need to export this function, so don't.  Michaël didn't
actually write the patch, but we list him as first author because with a
trivial one like this, intellectual authorship is as important (if not
more) as bit shovelling.

Author: Michaël Paquier, Amit Langote
Discussion: https://postgr.es/m/c91299c4-199b-0f16-339b-a29d6d2a39ee@lab.ntt.co.jp

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