Remove advertising clause from Berkeley BSD-licensed files, per

Bruce Momjian <bruce@momjian.us>

Commit: 9dd3ec6c3b3334bc09fad85f2e0393b5cf9e7b84
Author: Bruce Momjian <bruce@momjian.us>
Date: 2007-03-26T21:44:11Z
Releases: 8.3.0
Remove advertising clause from Berkeley BSD-licensed files, per
instructions from Berkeley.

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