Rename top level adaptabuild to adaptabuild_config.mak

[rhempel]

As a result of making adaptabuild a submodule for my umm-malloc library there will be a conflict between the adaptabuild.mak file that specifies how to build the library, and the adaptabuild.mak that sets up how adaptabuild is configured for a project that includes the module.

To make things even clearer, we rename the library level adaptabuild.mak to adaptabuild_library.mak

We solve this by having the following files at the top level of any code that is built with adaptabuild (project or library)

• adpatabuild_library.mak - specifies how to build the library (library only)
• adaptabuild_config.mak - configuration of logging, source and build directories, etc (project or library)
• adaptabuild_products.mak - products that can be specified on the command line (project or library)
• adaptabuild_artifacts.make - artifacts that are needed for the build (project or library)

Let's see if this works in the general case :-)