tzfilename is used to keep current timezone filename
isGMT is used to know how to handle rtc clock
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10175 a95241bf-73f2-0310-859d-f6bbb57e9c96
added prototypes for set_tzspecs, used for setting these fields
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10132 a95241bf-73f2-0310-859d-f6bbb57e9c96
real time shared page (it contains the boot time offset and the system
time conversion factor for now).
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9850 a95241bf-73f2-0310-859d-f6bbb57e9c96