patch 7.4.1973

Problem:    On MS-Windows the package directory may be added at the end
            because of forward/backward slash differences. (Matthew
            Desjardins)
Solution:   Ignore slash differences.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1973,
 /**/
     1972,
 /**/