Remove a straggling link attribute

This is handled by Cargo now
servo · bors-servo · Dec 15, 2015 · Dec 15, 2015 · Dec 15, 2015 · 77344dbcfc1ab61155a55f40c3a6b0cc7816fdb2
commit 77344dbcfc1ab61155a55f40c3a6b0cc7816fdb2
diff --git a/core-foundation-sys/src/date.rs b/core-foundation-sys/src/date.rs
@@ -10,7 +10,6 @@
 pub type CFTimeInterval = f64;
 pub type CFAbsoluteTime = CFTimeInterval;
 
-#[link(name = "CoreFoundation", kind = "framework")]
 extern {
     pub fn CFAbsoluteTimeGetCurrent() -> CFAbsoluteTime;
 }