cmdline: read the "high-priority" and "clock-source" options early
The value of the command line parameter will need to be known early, when we call vlc_threads_setup().
This broke with !1274 (merged).
v2:
- always call
config_CmdLineEarlyScan()
but use ifdefs for when the parameters checked should exist.
v3:
- "high-priority" is also found on OS/2
- don't do anything in
config_CmdLineEarlyScan()
if no parameter is going to be used
Edited by Steve Lhomme