MFV: r306687

Merge byacc 20160606.

Regen test cases for yacc(1) after r274460. YYINT is int now.

PR: 194982

Update to byacc 20140409
Among all the modifications, this new byacc also solves a 14 year old bug [1]

PR: bin/23254 [1]
Submitted by: marka@nominum.com [1]
MFC after: 3 weeks