Fix warnings of FlipperKit in iOS

Summary:
This diff fixes the warnings raised from FlipperKit. Also this diff updates the deployement target of FlipperKit  to iOS 10. Even wilde assumes the min deployment OS version to be iOS 10. In layout plugin we use [UIAccessibiltyTraiTabBar](https://developer.apple.com/documentation/uikit/uiaccessibility/uiaccessibilitytraits/1648592-tabbar), which assumes iOS 10 and above.

Partially fixes https://github.com/facebook/flipper/issues/803

Still there are some warnings which are coming from the dependencies outside of Flipper.

Reviewed By: passy

Differential Revision: D19941558

fbshipit-source-id: 31809fedb9aa297bc318b5af72e29e8444f0142f

iOS/FlipperKit/FlipperDiagnosticsViewController.m

@@ -120,7 +120,7 @@ static NSString* const kSKCellIdentifier =
 }
 
 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
-  return UIInterfaceOrientationMaskPortrait;
+  return UIInterfaceOrientationPortrait;
 }
 
 @end

iOS/FlipperKit/FlipperPlugin.h

@@ -11,7 +11,7 @@
 
 SK_EXTERN_C_BEGIN
 void FlipperPerformBlockOnMainThread(
-    void (^block)(),
+    void (^block)(void),
     id<FlipperResponder> responder);
 SK_EXTERN_C_END
 

iOS/FlipperKit/FlipperUtil.m

@@ -10,7 +10,7 @@
 #import "FlipperResponder.h"
 
 void FlipperPerformBlockOnMainThread(
-    void (^block)(),
+    void (^block)(void),
     id<FlipperResponder> responder) {
   if ([NSThread isMainThread]) {
     @try {