On desktop, blit depth when not cleared.

Workaround for #1283, makes Jeanne d'Arc playable.
Update native (fbo change on non-ES, read/draw_framebuffer)
Merge pull request #5010 from unknownbrackets/depth-copy

On desktop, blit depth when not cleared
Typo fix
Fix Qt for Maemo
Fix crash in non-buffered rendering.
Merge pull request #5012 from raven02/patch-6

Typo fix