Add libaio as an input, such that QEMU is built with support for Asynchronous
I/O (AIO).
* gnu/packages/virtualization.scm (qemu)[inputs]: Uncomment libaio.
* gnu/packages/patches/qemu-CVE-2017-11334.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/virtualization.scm (qemu)[source]: Use it.