To reduce test failure.

Now topcgi.t should pass on windows.
For 0.0_7 (with fcgi-memleak.t exit status fix)
More to reduce test failures.

* registry.t now uses utime() instead of OS touch
* fcgi-memleak.t exit code problem might be fixed.
* rlimit.t should skip darwin
To remove uses of // operator, which harms tests on perl-5.8.9
v0.0_8