patch 7.4.915

Problem:    When removing from 'path' and then adding, a comma may go missing.
            (Malcolm Rowe)
Solution:   Fix the check for P_ONECOMMA. (closes #471)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    915,
 /**/
     914,
 /**/