config-host.mak: remove CONFIG_QEMU_SHAREDIR

There is no code using that variable according to 'git grep', so kill
it.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

configure

@@ -3027,7 +3027,6 @@ echo "sysconfdir=$sysconfdir" >> $config_host_mak
 echo "qemu_docdir=$qemu_docdir" >> $config_host_mak
 echo "qemu_confdir=$qemu_confdir" >> $config_host_mak
 echo "libexecdir=\${prefix}/libexec" >> $config_host_mak
-echo "CONFIG_QEMU_SHAREDIR=\"$prefix$datasuffix\"" >> $config_host_mak
 echo "CONFIG_QEMU_HELPERDIR=\"$prefix/libexec\"" >> $config_host_mak
 
 echo "ARCH=$ARCH" >> $config_host_mak