Start the DOSVM tick timer when the GET_SYSTEM_TIME interrupt
(int 1a ah 00) is fired. This fixes a bug when running Sid Meier's
CIVILIZATION for Windows 3.1 where the game would appear to hang at the
launch screen (although sound would play as expected). This was due to
the BIOSDATA.Ticks field never being updated.
Signed-off-by: Liam Middlebrook <liammiddlebrook@gmail.com>