This regenerates the scanner and parser files. I'm checking them
into master only. If they work for everyone using them, they can be
merged into 3.6.0.
dgn_yacc.c: I reconstructed our 3.4.3 patch for byacc 1.9 (the original,
not the one used to create the set of files being replaced here) by
comparing dgn_yacc.c made with vanilla byacc and dgn_yacc.c from 3.4.3.
(Unlike lev_comp.l, dgn_comp.l has hardly changed at all.) There's no
dynamic memory use in that version, so declarations for malloc and/or
realloc and/or inclusion of <stdlib.h> aren't an issue. The fixed size
stack it uses is big enough for 'make update' to run to completion.
lev_yacc: I built it with [modified] byacc to replace one built with
bison. sys/share/lev_comp.h was from byacc, not bison, so something has
gotten screwed up recently.
*_lex.c: I used the same version of flex (2.5.37) as the one used to
create the set being replaced, so build prospects are the same. But I
used -L to suppress #line directives and my Makefile has an extra 'sed'
pass that strips trailing spaces, producing extra bands in the diff.
*_comp.h: They're the same as far as git is concerned (ie, only the
file creation/modification dates changed), so there's no update.
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