header (C) fixes
Automated rebranding to Oracle copyright/license strings via filemuncher
IPRT,SUPDrv: Changed RTTHREADPREEMPTSTATE breaking binary compatibility - increased the major SUPDrv version.
IPRT,HostDrv,AddDrv: Export public IPRT symbols for the linux kernel (pain).
iprt: reverted r37922, it is not needed after I purge out/
iprt: temporarily disable RTThreadPreemptRestore for Windows hosts as it prevents me from building the Windows additions
IPRT: Added RTThreadPreemptIsEnabled, RTThreadPreemptDisable and RTThreadPreemptRestore. Made the logger check that preemption is enabled before trying to take the semaphore on Solaris and Windows.