[rbpi] - bump libnfs to 1.6
[depends] - bump libnfs to 1.6.0 - fixes issues with newer kernel-nfs-server
[win32] - bump libnfs to 1.6
[osx] fixed, xcode3 wants this
explicitly set 32/64bit ARCHS in XBMC.app

so it can be built for 64bit on 32bit machines

refs #2786
Merge pull request #2793 from Memphiz/nfs1.6

[nfs] bump to libnfs 1.6
[osx] changed, remove dyload of vda, link to framework instead
[xcode] remove ref to nonexisting file, thx mdd
[xcode] fixed packaging of XBMC.app, explicitly set SDKROOT in XBMC.app target, thx mdd
softae: use passed buffer not something else when consuming data