ui: fix macOS build

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/gl_macos.m

@@ -57,6 +57,7 @@ CVDisplayLinkRef displayLink;
 	CVDisplayLinkSetCurrentCGDisplay(displayLink, dispID);
 }
 - (void)prepareOpenGL {
+	[super prepareOpenGL];
 	// Bind a default VBA to emulate OpenGL ES 2.
 	GLuint defVBA;
 	glGenVertexArrays(1, &defVBA);

ui/app/os_macos.go

@@ -19,10 +19,10 @@ import (
 	"time"
 	"unsafe"
 
+	"gioui.org/ui"
 	"gioui.org/ui/f32"
 	"gioui.org/ui/key"
 	"gioui.org/ui/pointer"
-	"gioui.org/ui"
 )
 
 func init() {
@@ -140,7 +140,7 @@ func (w *window) draw(sync bool) {
 			X: width,
 			Y: height,
 		},
-		Config: *cfg,
+		Config: &cfg,
 		sync:   sync,
 	})
 }

ui/go.mod

@@ -1,8 +1,8 @@
 module gioui.org/ui
 
+go 1.12
+
 require (
 	golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f
 	golang.org/x/sys v0.0.0-20190329044733-9eb1bfa1ce65
 )
-
-go 1.12