[osx] - add function for identifying osx snow leopard runtime
[settings] - add settingscondition OsxIsSnowLeopard
[osx/settings] - make the fake fullscreen option only visible when running
on snowleopard - it leads to black screen on all later osx versions
Merge pull request #4922 from Memphiz/osxfakefullscreenbp

[osx] - only show the fake fullscreen option on snow leopard
[lang] update of internal addon language files
[lang] update of core language files
[lang] update of skin.confluence language files
Merge branch 'Gotham' of https://github.com/xbmc/xbmc into Gotham
glib & avahi: fix compile/configure flags
samba: update to samba-3.6.24
libnfs: bump soname
libnfs: Build from libnfs master
CMakeLists.txt: Remove duplicate expat build
Merge pull request #139 from quasar1/Gotham

Sync Gotham from test repo