vo_opengl: x11egl: reject nvidia drivers when autoprobing

Newer nVidia drivers support EGL, but they seem to work badly,
apparently don't support some needed features or not in a form we want
(such as swap control), and vdpau interop is not available. Disable it
by default, because I'm tired of explaining this issue.

Can be reverted as soon as nVidia release working drivers.

video/out/opengl/x11egl.c

@@ -160,6 +160,12 @@ static int mpegl_init(struct MPGLContext *ctx, int flags)
     ctx->native_display_type = "x11";
     ctx->native_display = vo->x11->display;
 
+    if (vo->probing) {
+        const char *vendor = ctx->gl->GetString(GL_VENDOR);
+        if (vendor && strstr(vendor, "NVIDIA Corporation"))
+            goto uninit;
+    }
+
     return true;
 
 uninit: