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date	2012.05.21.13.31.26;	author bapt;	state Exp;
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@SVN rev 235723 on 2012-05-21 13:31:26Z by bapt

Import byacc from invisible island, it brings us lots of compatibilities with
bison, keeping full compatibility with our previous yacc implementation.

Also bring the ability to create reentrant parser

This fix bin/140309 [1]

PR:		bin/140309 [1]
Submitted by:	Philippe Pepiot <ksh@@philpep.org> [1]
Approved by:	des (mentor)
MFC after:	1 month
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@Berkeley Yacc (byacc) is a LALR(1) parser generator.  Berkeley Yacc
has been made as compatible as possible with AT&T Yacc.  Berkeley
Yacc can accept any input specification that conforms to the AT&T
Yacc documentation.

Some programs depend on a byacc (instead of bison).
@
