configure.ac: Require Automake 1.10
configure.ac: Require Automake 1.10

- Have Automake error out if its version is less than 1.10, since problems
have been observed with 1.9

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr