could not load inserted library 'skype-poll-fix.dylib' on OS X

I got this error when starting skype (6.17 build 477):

```
» DYLD_INSERT_LIBRARIES=skype-poll-fix.dylib /Applications/Skype.app/Contents/MacOS/Skype
dyld: could not load inserted library 'skype-poll-fix.dylib' because no suitable image found.  Did find:
	skype-poll-fix.dylib: mach-o, but wrong architecture
```

Skype is for i386 architecture, so, here is the fix for that.