Refine the makefiles.

* Introduce libbcc.mk which defines the path for makefiles and libbcc
  configuration.
* Introduce libbcc-{device,host}-build.mk which defines the build
  flags for building libbcc itself and/or for building module using
  libbcc.
* Add header guard for generated ConfigFromMk.h.

Change-Id: I892f6d3637f628ea6aa0116d92ebc54770ce3a47
15 files changed