[Crash-utility] [ANNOUNCE] gcore extension module update

This update fixes a bug and improves register restoration for active tasks. See the ChangeLog below. Note that there's no support range change on kernel versions and architectures. Thanks Dave for your reviewing. ChangeLog: - Fix a bug that for a multi-thread tasks, register values for all the tasks are equal to the register values of the task specified by user in command-line. (d.hatayama(a)jp.fujitsu.com) - Retrieve register values in exception frame on kernel stack that is leaved by KDUMP, NETDUMP or DISKDUMP mechanism. Also, use register values included in note information of KVMDUMP format. (d.hatayama(a)jp.fujitsu.com) Thanks. HATAYAMA Daisuke