Fix a bug where we were requiring that all paths in $PATH be absolute. Some users provide relative paths in their environment, and we should respect those.

opal/util/path.c

@@ -231,16 +231,18 @@ char *opal_path_access(char *fname, char *path, int mode)
 {
     char *fullpath = NULL;
     struct stat buf;
+    bool relative;
 
     /* Allocate space for the full pathname. */
     if (NULL == path) {
         fullpath = opal_os_path(false, fname, NULL);
     } else {
-        fullpath = opal_os_path(false, path, fname, NULL);
+        relative = !opal_path_is_absolute(path);
+        fullpath = opal_os_path(relative, path, fname, NULL);
     }
-    if (NULL == fullpath)
+    if (NULL == fullpath) {
         return NULL;
-
+    }
     /* first check to see - is this a file or a directory? We
      * only want files
      */