Compatibility: DPMI 0.9+
Expects: AX    0902H
                                                                  
Returns: CF    NC (clear; always successful)
AL    current setting: 00H = virtual interrupts are disabled
01H = virtual interrupts are enabled
                                                                  
Info: Obtains the current setting of the virtual interrupt flag.

This fn is recommended over using the PUSHF opcode and examining
the stack, since that returns the physical interrupt flag, rather
than the virtualized flag tracked by the DPMI host.

See Also: DPMI API
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INT 31H 0902H: Query Virtual Interrupt State