Implemented TLS for all platforms.

src/cocoa_init.m

@@ -103,6 +103,9 @@ int _glfwPlatformInit(void)
 
     _glfwInitJoysticks();
 
+    if (!_glfwInitOpenGL())
+        return GL_FALSE;
+
     _glfwLibrary.NS.eventSource = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
     if (!_glfwLibrary.NS.eventSource)
         return GL_FALSE;
@@ -143,6 +146,8 @@ int _glfwPlatformTerminate(void)
 
     _glfwTerminateJoysticks();
 
+    _glfwTerminateOpenGL();
+
     return GL_TRUE;
 }