Fix crash if a DROP is attempted on an internally-dependent object.

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

Commit: ddf8b7702060f4e29a4f411cb09861e6076cf5c9
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-09-22T15:46:43Z
Releases: 8.4.2
Fix crash if a DROP is attempted on an internally-dependent object.
Introduced in 8.4 rewrite of dependency.c.
Per bug #5072 from Amit Khandekar.

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