android: fix makefile to build on AOSP

relative path seems could be buggy on aosp,
also some remains in include could make problems.

Change-Id: I4fcbf1bb8d7588d670e2fc5f8beb71397175c8bb
android: fix simple path for cm, add note for later

current AOSP (master) seems a bit different regarding
the variable $(TARGET_OUT_INTERMEDIATES)

Change-Id: I4a92743124950fadffcbff2b88f455db09a45d9e
darwin: fix make prepare, force prebuilt host compiler

also fix relative TARGET_OUT_INTERMEDIATES path on aosp/master

Change-Id: Ie26850726898dcd101eac88d29691a06a94648c5
selinux: remove dependency on libsepol static lib

runcon applet is including flask.h for constants

the only one required is SECCLASS_PROCESS (2)

Change-Id: Ia57abc21b291e7cbf81fdd031baaa5ac4436cbc8
route: remove useless ipv6 header

Change-Id: I4cb0f232be6b7060e9a1bd66b4946060911405de