For instance the libstdc++ testsuite requires BIONIC_TESTS=1 to
actually build the tests.
* development/testrunner/test_defs.py:
Parse the new extra_make_args attribute.
* development/testrunner/runtest.py:
Added support for extra make arguments. Some testsuite requires this to actually be built.
Changed the log statement to log what is actually being done.
* development/testrunner/test_defs.xml:
Added extra make argument to enable the libstdc++ tests.
Original author: niko
Automated import of CL 144501