Specifically add TMP directory for Android

There is an oversight in the adb tool that causes `adb shell` ->
$<command> to set the TMPDIR env param, but `adb shell <command>` does
not. Binaries that use env.cc on Android will have inconsistent behavior
between interactive and non-interactive versions of `adb shell` until
that bug (which has been fixed internally) arrives on released versions
of adb.

This change adds the /data/local/tmp directory as a final fallback for
Android devices that support it (/data/local/tmp seems to be the de
facto "anyone can use this" Android tmp directory based on Mobile
Harness's use of it, my own discovery that it works better than other
directories, and that searching for it seems to back up the idea, but I
can't find official documentation supporting this). Devices that don't
support that directory will continue to fail, as they did before.

PiperOrigin-RevId: 179587386