Fixed configure.ac missing AM_PROG_AR.
Fixed configure.ac missing AM_PROG_AR.

cedar-renjun/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,shangdawei/LibSWD,ongjohn/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD