improve pkg-config files:

  - no need to have both chameleon-quark.pc.in and chameleon-starpu.pc.in
    - new file is chameleon.pc.in
  - create coreblas.pc.in and cudablas.pc.in
    - chameleon depends on coreblas and cudablas pkg-config files
  - re-write a little bit how libraries lists are converted into pkg-config style