use target_vendor as requested

Author: thomcc

src/backtrace/libunwind.rs

@@ -66,11 +66,7 @@ impl Frame {
         //
         // Note the `skip_inner_frames.rs` test is skipped on macOS due to this
         // clause, and if this is fixed that test in theory can be run on macOS!
-        if cfg!(target_os = "macos")
-            || cfg!(target_os = "ios")
-            || cfg!(target_os = "tvos")
-            || cfg!(target_os = "watchos")
-        {
+        if cfg!(target_vendor = "apple") {
             self.ip()
         } else {
             unsafe { uw::_Unwind_FindEnclosingFunction(self.ip()) }