envsetup.sh: cd to toplevel in get_build_var

dumpvar doesn't work right if we're not called from the toplevel;
due to the way the build system works internally, -C does not
suffice. This was already done in get_abs_build_var.

Redundant -C calls removed since we're at the toplevel already.

Change-Id: Iaaa48982547d099186922cc3ddc417a82c85e9a5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Merge "envsetup.sh: cd to toplevel in get_build_var"
Add policy for x86 emulator.
Merge "Add policy for x86 emulator."
Remove a non-existent directory from the include path.

Brings aarch64 in line with the other architectures.

Change-Id: Iba3fd33e34e3b5bc071f55cfe09de9e55a023cf7
Merge "Remove a non-existent directory from the include path."
Merge branch 'master' of https://android.googlesource.com/platform/build into HEAD