Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This change contains a simpler Makefile replacement with only 62 lines
of directives, 10 rules, and a 13 line support script for dependencies. The
build dependencies have been minimised and in some cases, corrected.

FEATURES:
* All targets can be built from a clean tree in one invocation.
* Parallel builds (tested with -j32 on 8 cores).
* Auto discovery of modules via _info files.
* Hopefully complete dependencies via a simplified generator.
* CFLAGS are respected and appended to compile flags.
* LINTFLAGS can be set to add check options (e.g. LINTFLAGS=-v).
* 'make clean' doesn't build anything before cleaning now.
* 'make quiet=1' builds quietly. 'make check quiet=1 -j N' produces
  summary output like the former summary target.
* Non-phony test targets; tests are rebuilt only when dirty. Targets are:
  check, fastcheck and fullcheck, the latter runs in non-summary mode.
* 'make <module>.[check|fastcheck|fullcheck]' runs tests for single modules.

TODO:
* Support Makefile-web and any other scattered targets

NOTES:
* The changes to dependency generation expose a circular
  dependency between asort and order which is not fixed here.
* Tests always run their dependent tests. With -j support and
  minimised rebuilds via tighter dependencies, its not worth avoiding.
* Some targets have been dropped as uneeded (e.g. distclean, tools).
Signed-off-by: Jon Griffiths <jon_p_griffiths@yahoo.com>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Seems like my local Ubuntu install is giving bogus warnings.  Allow
local valgrind overrides.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Our first nested module; easy because noone else relies on it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

We create and upload an example for the web anyway, if people really need it.

It's reduced to a flag which means we stop processing the module.  We have
to enhance our dependencies a bit, but they've always been quite good.

This simplifies things quite a bit.

We no longer use libccan for tests, but explicit object lists.  This 
will catch missing dependencies.  API tests *do* get the module object
linked in now.
In addition, makefiles now correctly rebuild when a dependency changes
(gcc's -MD here), and when _info.c changes.