Make it compile for wasm

[vmx]

There's been a fruitful discussion at #421 on how to get regex to compile on the wasm32 target.

I decided to open a new issue to outline the next steps.

• Make a new release of memchr. Current HEAD already contains the changes that are needed.
• Make a new release of libc. Current HEAD has already changes that make memchr compile smoothly on wasm32.

Let's see if that's enough or further things are needed. I'll check ones the above ones are done.

[BurntSushi]

memchr 2.0.1 is out. I can't do anything about libc. :-)

[vmx]

@BurntSushi: I've one more for you. aho-corasick needs a new release. The current one is still using memchr 1.x.

[BurntSushi]

@vmx Done. I also put out a new release of regex, which also hadn't been seen a release since memchr got bumped.

[vmx]

I've open an issue on libc (rust-lang/libc#861) to do a new release. After that it should be possible to compile regex for wasm32.

[BurntSushi]

@vmx Looks like this is done! I fully expect to be using this regex crate in the browser by tonight. :P

[vmx]

My LALRPOP grammer (which uses regex) works in the browser, hence I consider this done. Thanks again everyone that was involved.

[BurntSushi]

@vmx w00t! If there's a way to share a demo that would be really awesome!