Use macro in scripts/galera_recovery.sh

@@ -0,0 +1,11 @@

+--- mariadb-10.1.22/scripts/galera_recovery.sh	2017-03-17 15:34:21.069733823 +0100

++++ mariadb-10.1.22/scripts/galera_recovery.sh_patched	2017-03-17 15:34:03.032133966 +0100

+@@ -68,7 +68,7 @@ parse_arguments() {

+ 

+ wsrep_recover_position() {

+   # Redirect server's error log to the log file.

+-  eval /usr/sbin/mysqld $cmdline_args --user=$user --wsrep_recover \

++  eval @sbindir@/mysqld $cmdline_args --user=$user --wsrep_recover \

+     --log-error="$log_file"

+   ret=$?

+   if [ $ret -ne 0 ]; then