Allow override of device asserts, including multi-device support.

Set in board file with TARGET_OTA_ASSERT_DEVICE.
(cherry-picked from commit 0f452f21fc9323b9d1fe746161761cf40aaa5030)

Change-Id: Icd10de924f2b88168912c9575174cebf6b0104ba
envsetup: add a helper to fix "out/target/common" not being really common

* out/target/common isn't really common, and if you do
  back to back builds for multiple devices, that is noticable.
* Use out/target/common-$device instead, and link the appropriate
  dir to out/target/common every time lunch() is run, if
  ANDROID_FIXUP_COMMON_OUT is set.
* Refer https://groups.google.com/forum/#!topic/android-building/ispbOgzoyg8
  for more info.

Change-Id: I11e7df0e68e2a60ce32576f06397d60fc9465b60
Add ARMv6J and ARMv6-VFP processor combo option

Cherry-picked from gingerbread branch.

Change-Id: I8015149184ab3e1ee61ef93c62a395233ad1d156
Re-add ARCH_ARM_HAVE_TLS_REGISTER for armv7

OpenGL needs this flag for armv7

For more information :
https://github.com/androidarmv6/android_bionic/commit/7bc88df02f887229738b08fd7f7bd2668805f306
https://github.com/androidarmv6/android_frameworks_native/commit/4ffa795a3e9f2d2a26766147b1cfedbe78e823d4

Change-Id: Ib68c17e2f8dd3c8c15f8f3ea235fe25a46d05b6a
Add repopick script from CM

patchset 4: cybojenix
  clean up the script:
    remove fetching from github
    cleaned up fetching locations of binaries
    if ANDROID_BUILD_TOP isn't defined, error out

PS 5:
  Added back the check if fetch succeeded.
  Fixed verbose print about fetching.

patchset 6:
  final changes
    fix detecting ANDROID_BUILD_TOP
    send all relavant data to stderr

Change-Id: If67c5f178d03fadd8b79b1908f4a9cb231efbb28
repopick: Add a way to checkout instead of cherrypick

This helps if you want to take a commit and its dependencies, and not
just a particular commit

Change-Id: Ib245cce560c7b0d6fd03198a8c69a13d4720a4cb
add support for overriding build.prop settings.

Change-Id: Ie4224d608b7bcb0c2087bd77bc954f8f5f9b6495
build: work around missing readlink -f on Mac

Change-Id: I5d56366cf33a2b02f1886c87815d00cff279779d