Makefile.am: explicitly set AUTOMAKE_OPTIONS = parallel-tests
Makefile.am: explicitly set AUTOMAKE_OPTIONS = parallel-tests

it seems AM_TESTS_ENVIRONMENT is not supported by the serial test
harness, which causes 'make distcheck' to fail with older automakes.
fortunately the older automakes can be forced to use the parallel test
harness.

farsightsec/fstrm,farsightsec/fstrm