Fixed OS X i386 Xcode builds on x86_64 build machines

[HofiOne]

1.)
Without assigning App-OSX.xcconfig to Kodi.app target building i386
target will not fix dependent libraries when bundling the Kodi.app with
copyframeworks-osx.command

copyframeworks-osx.command uses XBMC_DEPENDS that composed like
$(XBMC_DEPENDS_ROOT)/$(SDK_NAME)_$(CURRENT_ARCH)-target

CURRENT_ARCH not set correctly, without assigning App-OSX.xcconfig the
ONLY_ACTIVE_ARCH is not set and the builder machine architecture will
be used instead of the targeted architecture.

2.)
Also found that XCode 6.1.1 on OSX 10.10.4 does not build Kodi, suggest to recommend XCode 6.3.1 on 10.10

[HofiOne]

Sorry the first line

+On Mavericks (OSX 10.9.x) we recommend using Xcode 6.3.1.

was accidental, I've tested on 10.10 only and only that change suggested.

if you did it on a stock os and worked that is a much better test.
unfortunately using XCode 6.1.1 is problematic on my boxes (both at home and work) I'd be curious what could cause that problem

apart from that, i'v made a 2nd big mistake and pushed the 2 changes together when they are not related at all. the change in the xcode project file is necessary to build correct bundled app from the IDE.

[Memphiz]

Yes just change your branch so that it only contains the 2 lines in xcode and commit it as extra commit. After that do git rebase HEAD~2 -i and "r"ename the first and "f"ixup the scond commit. After that name the first commit correctly like you did already. After that force push to your repo and this PR gets updated automagically ...

[HofiOne]

I've successfully f@cked up the revert so creating a new pull request instead, sorry :/