Drop regex dependencies from chicken-core scripts

[Mario Domenech Goulart]

Make the following scripts use irregex instead of regex:

• dpkg-eggs.scm
• make-eggdoc.scm
• wiki2html.scm
• tools.scm

(are they even used?)

[Jim Ursetto]

This change appears to be unnecessary.

• dpkg-eggs.scm -- Claims dependency on regex, but actually has none; (use regex) can be removed.
• make-eggdoc.scm -- Claims dependency on regex, but actually has none; (use regex) can be removed.
• tools.scm -- Was already converted to irregex in 8a516a0425.
• wiki2html.scm -- Also depends on htmlprag and matchable, so converting to irregex gains you nothing except verbosity.

Overall, it seems that (use regex) was added to tools.scm just to provide string-match, but string-match is only used in wiki2html.scm, which already depends on regex.

[Mario Domenech Goulart]

You are right, Jim. Boy, what a mess I've made!

I have no idea why I thought/saw string-match in tools.scm. I'm really sorry for all the confusion.

[Jim Ursetto]

Attached will fix by removing unused regex deps. Should I push it myself?

Note that dpkg-eggs.scm is still broken afterward because it uses ##sys#pathname-directory-separator, which no longer exists. It could be changed to make-pathname but it's probably safer for Ivan to fix that (if it is still in use).