Add .cvsignore file so cvs doesn't complain if you have lex/yacc

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

Commit: b01a272755f3a66a033db6da92c4d0fcb44cdb40
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-03-21T02:43:58Z
Releases: 7.1.1
Add .cvsignore file so cvs doesn't complain if you have lex/yacc
output files laying about.

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