[Buildroot] Changes to buildroot for projects.

[Ulf Samuelsson]

> Ulf,
> 
> I wanted to tell you how great the changes to add BSP PROJECT_DIR and the
> like have been working out. I did two product releases today and it was really
> great to be able to build both and share compiled packages between the two.
> Very well done.
> 

Yes, but it is going to need some additional work.

All packages which can be configured in different ways,
needs to be built in PROJECT_BUILD_DIR if you want
to configure them differently.
As long as you have the same configuration, BUILD_DIR is still OK.

Also, I would like to be able to easily save the current configuration
of the different ".config" files easily in a new board directory.

$ make project

or similar should create

project/config/$(PROJECT)

and store the current config for Linux, busybox, uclibc 
and the main .config file in that directory.


> - -Steve
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Best Regards
Ulf Samuelsson