qemu-system-aarch64 for linux-x64.

To be used for tests in server builds e.g. presubmit.
diff --git a/linux-x64/qemu/LICENSE b/linux-x64/qemu/LICENSE
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+++ b/linux-x64/qemu/LICENSE
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+The following points clarify the QEMU license:
+1) QEMU as a whole is released under the GNU General Public License,
+version 2.
+2) Parts of QEMU have specific licenses which are compatible with the
+GNU General Public License, version 2. Hence each source file contains
+its own licensing information.  Source files with no licensing information
+are released under the GNU General Public License, version 2 or (at your
+option) any later version.
+As of July 2013, contributions under version 2 of the GNU General Public
+License (and no later version) are only accepted for the following files
+or directories: bsd-user/, linux-user/, hw/vfio/, hw/xen/xen_pt*.
+3) The Tiny Code Generator (TCG) is released under the BSD license
+   (see license headers in files).
+4) QEMU is a trademark of Fabrice Bellard.
+Fabrice Bellard and the QEMU team
diff --git a/linux-x64/qemu/README.md b/linux-x64/qemu/README.md
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+qemu-system-aarch64 2.12.1
+``` shell
+tar xf qemu-2.12.1.tar.xz
+cd qemu-2.12.1
+./configure --target-list=aarch64-softmmu --disable-gtk --disable-vnc --disable-vhost-net --disable-vhost-vsock --disable-vhost-user --disable-vhost-scsi --disable-vhost-crypto --disable-libxml2 --disable-libusb --disable-tpm --disable-kvm --disable-qom-cast-debug --disable-guest-agent --disable-replication --disable-live-block-migration --disable-blobs
+strip aarch64-softmmu/qemu-system-aarch64
+ls aarch64-softmmu/qemu-system-aarch64 pc-bios/efi-virtio.rom
diff --git a/linux-x64/qemu/aarch64-softmmu/qemu-system-aarch64 b/linux-x64/qemu/aarch64-softmmu/qemu-system-aarch64
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+++ b/linux-x64/qemu/aarch64-softmmu/qemu-system-aarch64
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diff --git a/linux-x64/qemu/pc-bios/efi-virtio.rom b/linux-x64/qemu/pc-bios/efi-virtio.rom
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index 0000000..f4de595
--- /dev/null
+++ b/linux-x64/qemu/pc-bios/efi-virtio.rom
Binary files differ