Re-add pg_index.indisclustered in a minimalist way. Also fix BSDi

Bruce Momjian <bruce@momjian.us>

Commit: f756acf8a8972ffe84cc711b9963b9cb003032f1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2001-05-15T01:12:59Z
Releases: 7.2.1
Re-add pg_index.indisclustered in a minimalist way.  Also fix BSDi
dynamic linker change.  #include must be before #ifdef test.

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