use findstr instead of contains for older matlab version

matlab/gdatpaths.m

@@ -10,8 +10,8 @@ end
 
 a=which('gdat');
 path_gdat = fileparts(a);
-if ~contains(path,[path_gdat,':'])
-  warning('Folder %s containing gdat.m is not in your path!!',path_gdat); 
+if ~findstr(path,[path_gdat,':'])
+  warning('Folder %s containing gdat.m is not in your path!!',path_gdat);
 end
 
 if isempty(a), error('gdat is not in the MATLAB path'); end