Cocoa: Remove checks for pre-10.8 SDK

OS X 10.8 is now the minimum required version but these checks were not
removed when that change was made.
diff --git a/src/cocoa_init.m b/src/cocoa_init.m
index 2575f8e..ab46f56 100644
--- a/src/cocoa_init.m
+++ b/src/cocoa_init.m
@@ -435,13 +435,9 @@
 
         if ([[NSBundle mainBundle] pathForResource:@"MainMenu" ofType:@"nib"])
         {
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
             [[NSBundle mainBundle] loadNibNamed:@"MainMenu"
                                           owner:NSApp
                                 topLevelObjects:&_glfw.ns.nibObjects];
-#else
-            [[NSBundle mainBundle] loadNibNamed:@"MainMenu" owner:NSApp];
-#endif
         }
         else
             createMenuBar();
diff --git a/src/nsgl_context.m b/src/nsgl_context.m
index 1a709bb..e26dae7 100755
--- a/src/nsgl_context.m
+++ b/src/nsgl_context.m
@@ -232,9 +232,7 @@
         //       Info.plist for unbundled applications
         // HACK: This assumes that NSOpenGLPixelFormat will remain
         //       a straightforward wrapper of its CGL counterpart
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
         addAttrib(kCGLPFASupportsAutomaticGraphicsSwitching);
-#endif /*MAC_OS_X_VERSION_MAX_ALLOWED*/
     }
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= 101000