Clean up shared makefile install procedures.

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

Commit: e1942f5b9e1c71e3f5e912ab9ffeb1e34339845d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1998-10-18T19:41:00Z
Releases: 7.1.1
Clean up shared makefile install procedures.
Get the permissions right, don't overwrite real files with symlinks, etc.
plpgsql and odbc still aren't fully up to speed, but at least they don't crash and burn...

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