libcody: Simplify configure [PR 98414, 98509]

libcody: Simplify configure [PR 98414, 98509]

Libcody's configurey was overly 'clever'.  That didn't play well with
GCC's structure.  This removes lots of that overengineering, using
libcpp as an example.

	libcody/
	* Makefile.in: Remove auto parallelize, swallow Makesub.in. Don't
	check compiler name here.
	* Makesub.in: Delete.
	* build-aux/config.guess: Delete.
	* build-aux/config.sub: Delete.
	* build-aux/install-sh: Delete.
	* dox.cfg.in: Delete.
	* gdbinit.in: Delete.
	* internal.hh (BuildNote): Delete.
	* fatal.cc (BuildNote): Delete.
	* config.m4: Remove unneeded fns.
	* configure.ac: Remove unneccessary checks and configures.
	* configure: Rebuilt.
	* config.h.in: Rebuilt.