Upstream fixes for vulkan surface creation and the retina hint

https://github.com/glfw/glfw/commit/e108c0de0d531123b560931c07c5a226e7d7a3da
https://github.com/glfw/glfw/commit/980fc9b52f397ec54ce65f69abe9ff694622b4ab

glfw/cocoa_platform.h

@@ -117,6 +117,7 @@ typedef struct _GLFWwindowNS
     id              layer;
 
     GLFWbool        maximized;
+    GLFWbool        retina;
 
     // Cached window properties to filter out duplicate events
     int             width, height;

glfw/cocoa_window.m

@@ -592,14 +592,6 @@ static GLFWapplicationshouldhandlereopenfun handle_reopen_callback = NULL;
     _glfwInputWindowDamage(window);
 }
 
-- (id)makeBackingLayer
-{
-    if (window->ns.layer)
-        return window->ns.layer;
-
-    return [super makeBackingLayer];
-}
-
 - (void)cursorUpdate:(NSEvent *)event
 {
     updateCursorImage(window);
@@ -728,7 +720,7 @@ static GLFWapplicationshouldhandlereopenfun handle_reopen_callback = NULL;
         window->ns.yscale = yscale;
         _glfwInputWindowContentScale(window, xscale, yscale);
 
-        if (window->ns.layer)
+        if (window->ns.retina && window->ns.layer)
             [window->ns.layer setContentsScale:[window->ns.object backingScaleFactor]];
     }
 }
@@ -1285,8 +1277,7 @@ static GLFWbool createNativeWindow(_GLFWwindow* window,
 
     window->ns.view = [[GLFWContentView alloc] initWithGlfwWindow:window];
 
-    if (wndconfig->ns.retina)
-        [window->ns.view setWantsBestResolutionOpenGLSurface:YES];
+    window->ns.retina = wndconfig->ns.retina;
 
     if (fbconfig->transparent)
     {
@@ -2031,7 +2022,9 @@ VkResult _glfwPlatformCreateWindowSurface(VkInstance instance,
         return VK_ERROR_EXTENSION_NOT_PRESENT;
     }
 
-    [window->ns.layer setContentsScale:[window->ns.object backingScaleFactor]];
+    if (window->ns.retina)
+        [window->ns.layer setContentsScale:[window->ns.object backingScaleFactor]];
+    [window->ns.view setLayer:window->ns.layer];
     [window->ns.view setWantsLayer:YES];
 
     memset(&sci, 0, sizeof(sci));

glfw/nsgl_context.m

@@ -299,6 +299,9 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
         [window->context.nsgl.object setValues:&opaque forParameter:NSOpenGLContextParameterSurfaceOpacity];
     }
 
+    if (window->ns.retina)
+        [window->ns.view setWantsBestResolutionOpenGLSurface:YES];
+
     [window->context.nsgl.object setView:window->ns.view];
 
     window->context.makeCurrent = makeContextCurrentNSGL;