Update wxmac.rb

Slight version bump for wxmac from 3.0.0 to 3.0.1. Also, the patch that was previously included is now part of the wx source code and thus doesn't need to be reapplied, so I've removed the patch which shouldn't have any consequence.

Updated the SHA1.

Here's hoping the homebrew build bot doesn't hate me this time.
With `downloads`:

```
HTTP/1.1 302 Found
Location: http://superb-dca3.dl.sourceforge.net/project/wxwindows/3.0.1/wxWidgets-3.0.1.tar.bz2
HTTP/1.1 200 OK
```

Without:

```
HTTP/1.1 302 Found
Location: http://sourceforge.net/projects/wxwindows/files/3.0.1/wxWidgets-3.0.1.tar.bz2
HTTP/1.1 302 Found
Location: http://sourceforge.net/projects/wxwindows/files/3.0.1/wxWidgets-3.0.1.tar.bz2/download
HTTP/1.1 302 Found
Location: http://downloads.sourceforge.net/project/wxwindows/3.0.1/wxWidgets-3.0.1.tar.bz2?r=&ts=1402977690&use_mirror=softlayer-dal
HTTP/1.1 302 Found
Location: http://softlayer-dal.dl.sourceforge.net/project/wxwindows/3.0.1/wxWidgets-3.0.1.tar.bz2
HTTP/1.1 200 OK
```