[PATCH]: Always use KVM_VERSION to build version number

[Chris Lalancette <clalance@redhat.com>]

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Avi,
     Trying to use libvirt with development snapshots of qemu-kvm is a bit
problematic.  The trouble is that for all development snapshots, the value that
gets placed into this string:

QEMU PC emulator version 0.10.0 (kvm-devel), Copyright (c) 2003-2008

Is always kvm-devel.  That means we can't tell if this is a kvm development
snapshot built yesterday, or 6 months ago, which means that in turn we can't
tell what features are available.  While we can always tell people building
their own qemu to force it by echoing a value into KVM_VERSION, it would be much
better if this were done by default.  Something like kvm-88-devel, which would
signify that this the development happening after kvm-88, leading towards
kvm-89.  Would you accept something like the patch below, which would require
you to edit the KVM_VERSION file twice during a release (once right before the
release, to change it to kvm-89, and once right after the release to change it
back to kvm-89-devel)?

Signed-off-by: Chris Lalancette <clalance@redhat.com>

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diff --git a/KVM_VERSION b/KVM_VERSION
new file mode 100644
index 0000000..efd3e0e
--- /dev/null
+++ b/KVM_VERSION
@@ -0,0 +1 @@
+kvm-88-devel