[ios] - bump gas-preprocessor
[ios] - support Xcode 6.x and iOS 8 SDK

- use clang as default compiler for newer SDKs
- fakeroot: ignore interposing openat()
[ios] - fix libssh build with Xcode 6
[ios] - fix pil build with Xcode 6
[ios] - libRTV fix build for Xcode 6
ios] - fix libmpeg2 build error by making it even more PIC (also the real fix for the xcode5 build issue earlier)
[ios/atv2] - adapt readme - we support Xcode 6.0.1 against iOS 8 SDK
[osx] - adapt readme for compatibility with Xcode 6.1 with OSX SDK 10.10 under Yosemite
[ios/atv2] - adapt the readme for support with Xcode 6.1 against iOS SDK 8.1 on Yosemite
runscript: make sure to get the correct extension point to run
[videoinfoscanner] do not log username/password
[subtitles] do not log username/password
[playlistplayer] do not log username/password
[streamdetails] do not log username/password
[pvr] Fix unexpected sub channel merge in EPG grid

Using backend channel number, number would be not unique if any sub channel exist.
So don't use it to sense channel breaks. Use unique channel identifier instead.
Merge pull request #5403 from Memphiz/xcode6

[ios] - add support for compiling with Xcode 6 and iOS 8 SDK
Merge pull request #5563 from tamland/runscript-fix

runscript: make sure to get the correct extension point to run
Merge pull request #5568 from mkortstiege/redacted

[wip] redact username/password when logging
Merge pull request #5564 from janbar/fix_gridSubChannelMerge

[pvr] Fix unexpected sub channel merge in EPG grid
videoplayer: adapt lateness detection and dropping to buffering