[Crash-utility] [ANNOUNCE] gcore extension module version 1.0.2

ChangeLog: - Fix building failure due to design change of crash's library interface on version 5.1.5. Fix warnings on -Wmissing-prototypes. No functional change is given any other than version printing below. - Start giving gcore extension module version numbers. The initial version number is 1.0.2 (the former versions are used in development only.) - Add -V option for printing version information: crash> gcore -V gcore extension module: version 1.0.2 (released on 24 May 2011) Copyright (C) 2010, 2011 Fujitsu Limited Thanks. HATAYAMA Daisuke