(make_path): Reorder stat-then-mkdir-if-missing

(make_path): Reorder stat-then-mkdir-if-missing
calls so that mkdir is called first.  Before make_path would first
`stat' a directory, then call mkdir if it didn't exist.  But if
some other process created the directory between the stat & mkdir,
the mkdir would fail with EEXIST.  Diagnosis and suggestion from
Greg McGary.