Update to mapped_ioctl and linux emulation

[Matthew Dillon]

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:Hi all,
:
:I've been working with Simon Schubert on updating mapped_ioctl to handle 
:some special cases under the linux emulator (drm and oss sound 
:emulation), the attached patch fixes/adds support for mapping entire 
:ioctl ranges to other ranges. I've been running with this for a couple 
:days now and it's been fine here but we'd like to get more testing in. 
:Assuming no objections or bugs show up, Simon has said he'll commit this 
:on Monday evening.
:
:
:Thanks,
:Brock

    That looks like a nice cleanup!

					-Matt