Rename updateNodeLink to spgUpdateNodeLink.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 8f57b064fdaa682ddea60f5dc27c0a5d5fcbffab
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-12-19T20:38:32Z
Releases: 9.2.0
Rename updateNodeLink to spgUpdateNodeLink.

On reflection, the original name seems way too generic for a global
symbol.  A quick check shows this is the only exported function name
in SP-GiST that doesn't begin with "spg" or contain "SpGist", so the
rest of them seem all right.

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