GlobalShortcut: only build in the OS X-specific AXIsProcessTrustedWithOptions check if we're on a 10.9 or newer SDK.
GlobalShortcut: only build in the OS X-specific AXIsProcessTrustedWithOptions check if we're on a 10.9 or newer SDK.

Fixes OS X Universal build.

austinliou/mumble,LuAPi/mumble,SuperNascher/mumble,austinliou/mumble,austinliou/mumble,SuperNascher/mumble,LuAPi/mumble,LuAPi/mumble,Lartza/mumble,unascribed/mumble,Lartza/mumble,Lartza/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Lartza/mumble,unascribed/mumble,Lartza/mumble,Lartza/mumble,austinliou/mumble,unascribed/mumble,SuperNascher/mumble,LuAPi/mumble,LuAPi/mumble,LuAPi/mumble,unascribed/mumble,unascribed/mumble,unascribed/mumble,SuperNascher/mumble,austinliou/mumble,unascribed/mumble,LuAPi/mumble,SuperNascher/mumble,unascribed/mumble,SuperNascher/mumble,austinliou/mumble,austinliou/mumble,Lartza/mumble,LuAPi/mumble,SuperNascher/mumble,austinliou/mumble