drupal_path_match() utility function

This function was previously included as part of the drupal_lookup_path() optimization: maintain a whitelist of Drupal paths patch. Unfortunately, that patch eventually took off into a very different direction, which removed this very handy function.

What does this function do? -> "Check if a path matches any pattern in a set of patterns."
Prototype: function drupal_path_match($path, $patterns);

Really simple, but oh so handy. There's only one use case in core, in block.module's "do/don't show block on these Drupal paths" functonality. But it's obvious that it can be used in many modules as a granularity mechanism.
I do realize it's a bit late for this to get in, but it's a really simple change, which can easily be verified to be working (by testing the aforementioned block.module functionality).
To be fair, this is actually not even new code. I'm just refactoring existing code.

Gábor Hojtsy had confirmed that he wanted to see this function in Drupal 6, so I hope that it will still be accepted :)