generated sources in SRCS breaks because compile_et uses an evil
include of one .c file in another. Use a worse fix. Perhaps
DPSRCS is useful after all.
Don't put *.y in SRCS. Put the generated file in SRCS instead.
This fixes incomplete dependencies (mkdep can't work on *.y).
Don't override the default .l.c rule. Just use LFLAGS.
Fixed some style bugs.
e0eeac5f43