Rebuild toolchain as 64-bit binaries

Android 4.4's build process fails with a 32-bit linker because the
Chromium linking process tries to mmap > 4 GB into its address
space.
64-bit toolchains are now required.

Change-Id: I78e2490efff4024abd8f2184b12ca0f0b2d53931
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
114 files changed