Remove src/tool/backend, now that the content is on the web site and wiki.

Bruce Momjian <bruce@momjian.us>

Commit: 63f1ccd838a19e4a0923221b2f90e4e014cabf74
Author: Bruce Momjian <bruce@momjian.us>
Date: 2012-09-04T16:38:33Z
Releases: 9.3.0
Remove src/tool/backend, now that the content is on the web site and wiki.

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