qemu: add /usr/lib to AC_PATH_PROG for qemu-bridge-helper

For openSUSE the qemu-bridge-helper is installed in /usr/lib
So libvirt has to search it in this directory.
Signed-off-by: NMichel Normand <normand@linux.vnet.ibm.com>

configure.ac

@@ -2520,7 +2520,7 @@ AC_DEFINE_UNQUOTED([QEMU_USER], ["$QEMU_USER"], [QEMU user account])
 AC_DEFINE_UNQUOTED([QEMU_GROUP], ["$QEMU_GROUP"], [QEMU group account])
 
 AC_PATH_PROG([QEMU_BRIDGE_HELPER], [qemu-bridge-helper], [/usr/libexec/qemu-bridge-helper],
-                  [/usr/libexec:/usr/lib/qemu])
+                  [/usr/libexec:/usr/lib/qemu:/usr/lib])
 AC_DEFINE_UNQUOTED([QEMU_BRIDGE_HELPER], ["$QEMU_BRIDGE_HELPER"], [QEMU bridge helper])
 
 AC_ARG_WITH([macvtap],