Direct3D: do not use pixel shader when rendering subpictures

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
addons: vorepository: missing internal manifest stream creation check
addons: vorepository: Revert dev change of ADDONS_REPO_SCHEMEHOST

Partially reverts commit 79295631dab4ec033918dddaf51c7b1c6a89ad55.