Remove --sparc_cpu option from the configure list

  commit 9b9c37c3 always assume sparcv9,
the others are no longer supported. Remove --sparc_cpu option from the
configure list.
Signed-off-by: NChen Wei-Ren <chenwj@iis.sinica.edu.tw>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

configure

@@ -1096,7 +1096,6 @@ echo "  --fmod-inc               path to FMOD includes"
 echo "  --oss-lib                path to OSS library"
 echo "  --enable-uname-release=R Return R for uname -r in usermode emulation"
 echo "  --cpu=CPU                Build for host CPU [$cpu]"
-echo "  --sparc_cpu=V            Build qemu for Sparc architecture v7, v8, v8plus, v8plusa, v9"
 echo "  --disable-uuid           disable uuid support"
 echo "  --enable-uuid            enable uuid support"
 echo "  --disable-vde            disable support for vde network"