QOpenGLContext re-creation - orphanedTextures

The texture clean-up in the HW-integration has
two issues when QOpenGLContext is re-created.

1. texture going out-of-date (QOpenGLContext::aboutToBeDestroyed)
   and still being used/returned to be used

2. QOpenGLContext dies (QOpenGLContext::aboutToBeDestroyed)
   while an "discarded" QOpenGLTexture (an orphan) isn't deleted yet.
   (you can't delete a texture past it's ctx's QOpenGLContext::aboutToBeDestroyed)

This patch fixes both issues with a helper and a lambda on 3 HW-integration-backends:
wayland-egl, wayland-eglstream and linux-dmabuf

Fix for 1.:
Simple connection to a lambda that deletes the texture and removes them from the set of used textures.
Signal is QOpenGLContext::aboutToBeDestroyed

Fix for 2.:
A function in each backend: deleteSpecificOrphanedTexture(QOpenGLTexture *texture)
Also connected/called by QOpenGLContext::aboutToBeDestroyed
Deletes the texture (before deleteOrphanedTextures() does it too late)
and removes the dead pointer from the orphanage

Pick-to: 6.5
Change-Id: Iccce8845bb669df93f1be43cbe9b9d25f7fd5235
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

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