[ios8] - fix orientation bugs when compiling against ios 8.0 SDK (seems apple fixed
the 90 degree rotated display orientation since 8.0) - thx to mikrohard
[ios8] - fix external screen orientation on ios8 runtime when compiling with ios8 sdk
[ios8] - fix invisible textfield on native keyboard
[ios8] - fix crash in vtb when seeking (changed flag for dropping frames since ios8 runtime)
Merge pull request #5477 from Memphiz/ios8fixups

[ios8] - bugfixes for ios8 runtime