Add a useless call to glXQueryVersion() before doing anything in the GLX port to work around a bug in the VirtualBox OpenGL driver.

src/api/glx/mod.rs

@@ -41,6 +41,18 @@ impl Context {
                    opengl: &'a GlAttributes<&'a Context>, display: *mut ffi::Display)
                    -> Result<ContextPrototype<'a>, CreationError>
     {
+        // This is completely ridiculous, but VirtualBox's OpenGL driver needs some call handled by
+        // *it* (i.e. not Mesa) to occur before anything else can happen. That is because
+        // VirtualBox's OpenGL driver is going to apply binary patches to Mesa in the DLL
+        // constructor and until it's loaded it won't have a chance to do that.
+        //
+        // The easiest way to do this is to just call `glXQueryVersion()` before doing anything
+        // else. See: https://www.virtualbox.org/ticket/8293
+        let (mut major, mut minor) = (0, 0);
+        unsafe {
+            glx.QueryVersion(display as *mut _, &mut major, &mut minor);
+        }
+
         // loading the list of extensions
         let extensions = unsafe {
             let extensions = glx.QueryExtensionsString(display as *mut _, 0);     // FIXME: screen number