Fix objc_msgSend_fpret

Author: madsmtm

objc-sys/src/message.rs

@@ -76,7 +76,7 @@ extern_c! {
     // __x86_64__ and __i386__
 
     /// Only available on `target_arch = "x86_64"` or `target_arch = "x86"`
-    #[cfg(any(not(objfw), target_arch = "x86_64", target_arch = "x86"))]
+    #[cfg(all(not(objfw), any(target_arch = "x86_64", target_arch = "x86")))]
     pub fn objc_msgSend_fpret();
     // objc_msgSend_fpret_debug