SDL: Fixed build warnings

SDL Commits
1 
From 637bcd0b728c580a53198654b9bcc5f333a4a6e3 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 7 Nov 2021 11:19:07 -0800
Subject: [PATCH] Fixed build warnings

---
 src/joystick/iphoneos/SDL_mfijoystick.m | 18 +++++++++++-------
 src/render/metal/SDL_render_metal.m     |  7 -------
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/src/joystick/iphoneos/SDL_mfijoystick.m b/src/joystick/iphoneos/SDL_mfijoystick.m
index e657829d69..aa01657584 100644
--- a/src/joystick/iphoneos/SDL_mfijoystick.m
+++ b/src/joystick/iphoneos/SDL_mfijoystick.m
@@ -1085,13 +1085,17 @@ @implementation SDL_RumbleMotor {
 
 -(void)cleanup
 {
-    if (self.player != nil) {
-        [self.player cancelAndReturnError:nil];
-        self.player = nil;
-    }
-    if (self.engine != nil) {
-        [self.engine stopWithCompletionHandler:nil];
-        self.engine = nil;
+    @autoreleasepool {
+        if (@available(macos 11.0, iOS 14.0, tvOS 14.0, *)) {
+            if (self.player != nil) {
+                [self.player cancelAndReturnError:nil];
+                self.player = nil;
+            }
+            if (self.engine != nil) {
+                [self.engine stopWithCompletionHandler:nil];
+                self.engine = nil;
+            }
+        }
     }
 }
 
diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 1709fcea07..05d8a944bd 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1029,13 +1029,6 @@ - (void)dealloc
 }}
 
 
-// normalize a value from 0.0f to len into 0.0f to 1.0f.
-static inline float
-normtex(const float _val, const float len)
-{
-    return _val / len;
-}
-
 static int
 METAL_QueueSetViewport(SDL_Renderer * renderer, SDL_RenderCommand *cmd)
 {