Make Uninstall Rule Requested

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1371915

Environment: Ubuntu 14.04 - Qemu 2.1.1
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I've configured qemu with some --prefix, compiled the sources and
installed the binaries; now, for some reason, I need to uninstall qemu to
configure it with the default prefix, recompile the sources and reinstall
the binaries.
However, there's no rule to uninstall qemu.

All other packages which I have compiled and installed on my system offer
the possibility to uninstall it: why not Qemu?

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