winedos dll. Add routine for checking if process is Windows process.
Fix DOSVM_IsDos32 interface. Move real mode interrupt handler
manipulation routines to interrupts.c.
dll. Make CTX_SEG_OFF_TO_LIN work with 32-bit segmented pointers
common in DPMI32. Fix winedos initialization so that DOSMEM_Init(TRUE)
is only called when DOS executable is started.