Document the changes in "make test" behavior

       $ HARNESS_VERBOSE=yes make test

     Also, you will find logs for all commands the tests have executed

     in logs, test/test_*.log, one for each individual test.

     If you want to run just one or a few specific tests, you can use

     the make variable TESTS to specify them, like this:

       $ make list-tests

     Have a look at the manual for the perl module Test::Harness to

     see what other HARNESS_* variables there are.

     If you find a problem with OpenSSL itself, try removing any

     compiler optimization flags from the CFLAG line in Makefile and

     run "make clean; make".