Error when building on OSX about glutin

[tomaka]

cc @DavidPartouche

@bvssvni I've committed the fix in DavidPartouche/rust-cocoa, could you try to compile again and confirm that it works on your machine?

[bvssvni]

I get this:

Build failed, waiting for other jobs to finish...
Failed to run custom build command for `cocoa v0.1.0 (https://github.com/DavidPartouche/rust-cocoa#aa8982be)`
Process didn't exit successfully: `make -f makefile.msgsend` (status=2)
--- stdout
cc -Wall src/msgsend.m -o /Users/sven/rust/glutin/target/native/cocoa-ebcc268ffcd672e2/msgsend.o -c

--- stderr
src/msgsend.m:105:1: error: unknown type name 'NSEventSubtype'; did you mean 'NSEventType'?
NSEventSubtype invoke_msg_NSEventSubtype(id theReceiver, SEL theSelector) {
^~~~~~~~~~~~~~
NSEventType
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSEvent.h:56:20: note: 'NSEventType' declared here
typedef NSUInteger NSEventType;
                   ^
src/msgsend.m:106:13: error: use of undeclared identifier 'NSEventSubtype'; did you mean 'NSEventType'?
    return (NSEventSubtype)objc_msgSend(theReceiver, theSelector);
            ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSEvent.h:56:20: note: 'NSEventType' declared here
typedef NSUInteger NSEventType;
                   ^
2 errors generated.
make: *** [/Users/sven/rust/glutin/target/native/cocoa-ebcc268ffcd672e2/msgsend.o] Error 1

I didn't see this error, NSEventSubtype is only available from 10.10
I've removed it from the code so now it should work.

[bvssvni]

It works :)