madwifi-ng: convert to new style staging, fix packaging

madwifi-ng: convert to new style staging, fix packaging

* Build and install tools and modules seperately,
  "unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS" only for modules.
* Install man pages into correct location.
* Install headers needed by wpa-supplicant.
* Fix packaging of the tools-package (prepend package, use ${sbindir}/*)
* Remove PACKAGE_STRIP="no".
* Use INC_PR.

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
CC: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>