MariaRocks : Fix looking up sst_dump

storage/rocksdb/mysql-test/rocksdb/suite.pm

 package My::Suite::Rocksdb;
 
 @ISA = qw(My::Suite);
+use My::Find;
+use File::Basename;
+use strict;
 
 sub is_default { not $::opt_embedded_server }
 
-my ($sst_dump) = grep { -x "$_/sst_dump" } "$::bindir/storage/rocksdb", $::path_client_bindir;
+my $sst_dump=
+::mtr_exe_maybe_exists(
+  "$::bindir/storage/rocksdb$::opt_vs_config/sst_dump",
+  "$::path_client_bindir/sst_dump");
 return "RocksDB is not compiled, no sst_dump" unless $sst_dump;
-$ENV{MARIAROCKS_SST_DUMP}="$sst_dump/sst_dump";
+$ENV{MARIAROCKS_SST_DUMP}="$sst_dump";
 
 bless { };