build: remove cruft, simplifying dep generation.

We get rid of the sed-based processing which produces .v
files from .d files. The only purpose of the variable
assignments in the .v files ended up being a filter
expression in the ABBREVN macro. I think the idea here
was to show all the direct prerequisites of the target,
suppressing the ones computed by generated dependency rules.

* Makefile (ABBREVN): Just use $^ instead filtering
out $^ using the $(DEP_$@) computed variable that holds
all the dependencies. I don't see an issue. This is
only used for linking and it correctly shows the .o
files.
(DEPGEN): Macro removed.
(COMPILE_C_WITH_DEPS): Remove call to DEPGEN, removing
an ugly sed step from the compilation of each file.
(NL, CM, DEP): Macros removed.
(OBJS, EXTRA_OBJS): Directly write rule which makes
all objects depend on config.make.
(opt/lex.yy.o, opt/txr.o, opt/match.o, opt/parser.o,
opt/y.tab.o, dbg/lex.yy.o, dbg/txr.o, dbg/match.o,
dbg/parser.o, dbg/y.tab.o): Explicitly write direct
rules for these so the parser generation is correctly
hooked into the dependency graph.

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