remove some unused variables that can cause compilation problems on netbsd

ompi/mca/fs/lustre/fs_lustre.c

@@ -78,9 +78,6 @@ int mca_fs_lustre_component_init_query(bool enable_progress_threads,
 struct mca_fs_base_module_1_0_0_t *
 mca_fs_lustre_component_file_query (mca_io_ompio_file_t *fh, int *priority)
 {
-    int err;
-    char *dir;
-    struct statfs fsbuf;
     char *tmp;
 
     /* The code in this function is based on the ADIO FS selection in ROMIO

ompi/mca/fs/pvfs2/fs_pvfs2.c

@@ -81,9 +81,6 @@ mca_fs_pvfs2_component_file_query (mca_io_ompio_file_t *fh, int *priority)
      *   See COPYRIGHT notice in top-level directory.
      */
 
-    int err;
-    char *dir;
-    struct statfs fsbuf;
     char *tmp;
 
     /* The code in this function is based on the ADIO FS selection in ROMIO