Remove -ld_classic library because XCode is not up to date on the CI

Author: MatteoPologruto

certificates/install_darwin.go

@@ -20,8 +20,7 @@ package certificates
 #cgo CFLAGS: -x objective-c
 
 // Pass the list of macOS frameworks needed by this piece of Objective-C code.
-// The "-ld_classic" is needed to avoid a wrong warning about duplicate libraries when building with XCode 15.
-#cgo LDFLAGS: -framework Foundation -framework Security -framework AppKit -ld_classic
+#cgo LDFLAGS: -framework Foundation -framework Security -framework AppKit
 
 #import <Foundation/Foundation.h>
 #include "certificates_darwin.h"