Misc Android-related fixes.

- src/common/android/testing/mkdtemp.h:
  Fixes a compilation error when using the (recent) NDK r9b,
  see comments in the source file for details.

- android/test-driver, Makefile.am, Makefile.in:
  Autotools 1.12 changed the way tests are run during "make check"
  so add a new "custom test driver" to run tests on Android, and
  modify Makefile.am / Makefile.in accordingly. Otherwise,
  'make check' tried to run the tests on the host.

- android/test-shell.sh:
  Allow several tests to run in parallel on the device, by
  creating a custom test directory for each test process.
  This allows running "make check -j8" reliably.

- src/common/linux/file_id_unittest.cc:
  Disable the SelfStrip test on Android, since it assumes a 'strip'
  executable is available on the target system where the test runs.

BUG=NONE
R=mark@chromium.org, ted.mielczarek@gmail.com
TEST=android/run-checks.sh --ndk-dir=/path/to/android-ndk-r9b

Review URL: https://breakpad.appspot.com/904003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1259 4c0a9323-5329-0410-9bdc-e9ce6186880e