Revert "Revert "OGL: Switch depth buffers to GL_DEPTH_COMPONENT32F format.""

[CrossVR]

In the end the floating point depth buffer was more accurate, without it round-trip errors can still occur.

GL_DEPTH_COMPONENT24: https://www.dropbox.com/s/gflcz2p6yfm6frm/Schermafdruk%202015-06-06%2019.13.11.png?dl=0
GL_DEPTH_COMPONENT32F: https://www.dropbox.com/s/pxhnnceyue1srmk/Schermafdruk%202015-06-06%2020.34.58.png?dl=0

This will break mini-ninjas on mesa, but it is already broken on nvidia anyway.

[dolphin-emu-bot]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

• mario-tennis-menu on ogl-lin-mesa: diff
• mini-ninjas on ogl-lin-mesa: diff
• mkdd-efb on ogl-lin-mesa: diff
• mkwii-bluebox on ogl-lin-mesa: diff
• nsmbw-intro on ogl-lin-mesa: diff
• simpsons-tev on ogl-lin-mesa: diff
• smg2-fog on ogl-lin-mesa: diff
• tsp3-pinkgrass on ogl-lin-mesa: diff
• zww-water on ogl-lin-mesa: diff
• zww-waves on ogl-lin-mesa: diff
• chibi-robo-fastdepth on ogl-lin-nv: diff
• chibi-robo-zfighting on ogl-lin-nv: diff
• djfny-menu on ogl-lin-nv: diff
• ea-vp6 on ogl-lin-nv: diff
• ed-lighting on ogl-lin-nv: diff
• fifa-street on ogl-lin-nv: diff
• fortune-street-white-box on ogl-lin-nv: diff
• kirby-shadows on ogl-lin-nv: diff
• line-width-test on ogl-lin-nv: diff
• luigi-shadows on ogl-lin-nv: diff
• mario-tennis-menu on ogl-lin-nv: diff
• megaman-heat on ogl-lin-nv: diff
• mii-channel on ogl-lin-nv: diff
• mini-ninjas on ogl-lin-nv: diff
• mkdd-efb on ogl-lin-nv: diff
• mtennis-zfreeze on ogl-lin-nv: diff
• nfsu-purplerect on ogl-lin-nv: diff
• nfsu-reflections on ogl-lin-nv: diff
• nsmbw-intro on ogl-lin-nv: diff
• rs2-zfreeze on ogl-lin-nv: diff
• smg2-fog on ogl-lin-nv: diff
• sw3-dt on ogl-lin-nv: diff
• thps4-shadow on ogl-lin-nv: diff
• tos-invis-char on ogl-lin-nv: diff
• tsp3-pinkgrass on ogl-lin-nv: diff
• xenoblade-menu on ogl-lin-nv: diff
• zww-water on ogl-lin-nv: diff
• zww-waves on ogl-lin-nv: diff

_{^{automated-fifoci-reporter}}

[degasus]

LGTM