Modified Mac OS_VERSION string to include OS X version number in addition to Kernel version info.
DARWIN llcommon build now depends on Carbon in order to provide this functionality.

Reviewed by Richard.

EXP-759 Opening the Voice preferences window from the up arrow on the speak button turns voice off for user without notice also causes calls to be ended

Automated merge with bundle:E:\code\viewer-experience+c:\users\richard\appdata\local\temp\thg.t3awyz\ssh__richard@hg.lindenlab.com_richard_viewer-experience-merge_2xcevh.hg

'We're having trouble connecting' message

STORM-1215: restore INSTALL_PROPRIETARY in Release builds, remove incorrect use of LL_RELEASE_FOR_DOWNLOAD from ReleaseOS

end point but avatar spins and shakes when arriving at click point

The reason was to manually resolve a couple of merge problems, as upstream has had several changes since this was applied, and some of the changes overlapped.