Mariabackup : don't change  argv[0] to "innobackupex" in innobackupex mode.
Mariabackup : don't change  argv[0] to "innobackupex" in innobackupex mode.

addr2line utility optionally used to output stacktrace relies relies on
correct my_progname, which is initialized from argv[0] from main function.
Thus, changing argv[0] can confuse stacktrace output.

natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2