Added patch to fix some glibc-isms.

Added PKG_BUILD_PARALLEL for faster compilation.

Rearranged slightly for consistency between packages.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

hplip was split into subpackages:

* hplip-common: generic files
* hplip-sane:   sane backend
  - patched to remove cups deps used only for network scanners
* hplip-cups:   cups driver (currently disabled)

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>