am 4a721df1: Use environment variables to pass information to pppd.

Merge commit '4a721df13a07ca36daafbb3785653979e3d1d393' into eclair-plus-aosp

* commit '4a721df13a07ca36daafbb3785653979e3d1d393':
  Use environment variables to pass information to pppd.
tree: f648558d9b1cb4f4366e16ee782c1f907024e365
  1. Android.mk
  2. l2tp.c
  3. MODULE_LICENSE_APACHE2
  4. mtpd.c
  5. mtpd.h
  6. NOTICE
  7. pptp.c