macOS: Fix compilation when using the 10.9 SDK or older.
diff --git a/src/video/cocoa/SDL_cocoaopengl.m b/src/video/cocoa/SDL_cocoaopengl.m
index f4acd62..c014308 100644
--- a/src/video/cocoa/SDL_cocoaopengl.m
+++ b/src/video/cocoa/SDL_cocoaopengl.m
@@ -322,7 +322,7 @@ Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
/* vsync is handled separately by synchronizing with a display link. */
interval = 0;
- [context setValues:&interval forParameter:NSOpenGLContextParameterSwapInterval];
+ [context setValues:&interval forParameter:NSOpenGLCPSwapInterval];
if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
Cocoa_GL_DeleteContext(_this, context);