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Currently, ndk-which uses a global tmpdir that it creates and
removes. If two instances of ndk-which run at the same time, they
conflict and one or both of them may fail. This changes to use a
per-process temporary directory in order to avoid that problem.

Change-Id: I554736fef814f78a5e9398e9b8cad0d700ba98c6

This script provides convenient access to the various components of the
Android NDK toolchain.  For example:  if you have a need to run the
NDK's '<arch>-linux-androideabi-nm' utility on some android target
file, you can do it now with `ndk-which nm` instead of (example)
$NDK/toolchains/.../prebuilt/linux-x86/bin/<arch>-linux-androideabi-nm

Change-Id: I841c70af7f2f09cec2ee23919489a7e2db83f105