'ps_1general' and 'fulltext_cache' test cases.


mysql-test/r/fulltext_cache.result:
  To pass on Windows, round to less digits
mysql-test/t/fulltext_cache.test:
  To pass on Windows, round to less digits
mysql-test/t/ps_1general.test:
  To pass on Windows, change \\ to / in result
mysql-test/t/rpl_delete_all.test:
  To pass on Windows, change \\ to / in result
mysql-test/mysql-test-run.pl:
  Pass mysqld --console to catch output on Windows
mysql-test/lib/mtr_process.pl:
  Check error from exec() to avoid becoming a fork() bomb