mysql-test/mysql-test-run.pl : Use fixed path names for all NDB binaries,

because searching for them makes the script abort with all non-NDB builds.


mysql-test/mysql-test-run.pl:
  Checking with "mtr_exe_exists()" for the location of a binary will yield an error
  if the binary is found nowhere at all, and this happens with NDB binaries in all
  builds that do not contain NDB;  so the correct way is fixed path names only.
  Still part of the fix for the #21721 bug.

mysql-test/mysql-test-run.pl

@@ -1299,10 +1299,8 @@ sub executable_setup () {
     $path_ndb_tools_dir=  "$glob_basedir/bin";
     $exe_ndb_mgm=         "$glob_basedir/bin/ndb_mgm";
     $exe_ndb_waiter=      "$glob_basedir/bin/ndb_waiter";
-    $exe_ndbd=            mtr_exe_exists("$glob_basedir/libexec/ndbd",
-                                         "$glob_basedir/bin/ndbd");
-    $exe_ndb_mgmd=        mtr_exe_exists("$glob_basedir/libexec/ndb_mgmd",
-                                         "$glob_basedir/bin/ndb_mgmd");
+    $exe_ndbd=            "$glob_basedir/bin/ndbd";
+    $exe_ndb_mgmd=        "$glob_basedir/bin/ndb_mgmd";
   }
 
   $exe_master_mysqld= $exe_master_mysqld || $exe_mysqld;