Build bugfix: if a config.h header exists in $(top_srcdir),

then that header is used when building in a separate directory,
instead of the config.h generated in that directory.
To fix this, we move config.h into a config/ subdirectory.
The $(top_srcdir)/config is not in the include search path
when buiding in a separate build directory.
While we are at it, let's move all the configure materials
generated by the configure script into config/.

* Makefile: include config/config.make at the top. Removing the
rule which asserts the existence of configuration based on
the presence of config.make.
(CFLAGS): Add $(conf_dir) to include search path with -iquote.
(notconfigured): New conditionally-defined target for producing
the error message when the build system is not configured.
(NL, DEP): New variables.
($(OBJS)): Make dependent on config/config.make and config/config.h
with help of DEP macro.
(opt/lex.yy.o, dbg/lex.yy.o): Express dependency using DEP.
(y.tab.h): Split off as a dependent on y.tab.c rather than
a co-target in the rule.  The rule has a body to handle
the situation when y.tab.h is missing for some reason, but
y.tab.c already exists (and so won't be re-made, and so
y.tab.h won't be remade).

* configure: Require GNU Make 3.81 rather than 3.80.
(conf_dir): New variable.
(config_h, config_make, config_log): New variables.  These are used in
place of config.h, config.make and config.log.  Add conf_dir to
config.make variable.

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