Before:
./x86-run ./x86/msr.flat
QEMU binary has no support for test device. Exiting.

After:
./x86-run ./x86/msr.flat
A QEMU binary was not found, You can set a custom
location by using the QEMU=<path> environment variable

Signed-off-by: Bandan Das <bsd@redhat.com>
Message-Id: <jpg384j1rkm.fsf@redhat.com>
[Fix invocation with QEMU environment variable. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>