Cocoa: Fix SDK version numbers

The pattern for version 10.10 and later was incorrectly applied to
version number for 10.8.

Fixes #1232.

src/cocoa_window.m

@@ -872,7 +872,7 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
 - (void)loadMainMenu
 {
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= 100800
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
     [[NSBundle mainBundle] loadNibNamed:@"MainMenu"
                                   owner:NSApp
                         topLevelObjects:&nibObjects];

src/nsgl_context.m

@@ -175,7 +175,7 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
         //       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 >= 100800
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
         addAttrib(kCGLPFASupportsAutomaticGraphicsSwitching);
 #endif /*MAC_OS_X_VERSION_MAX_ALLOWED*/
     }