patch 8.1.0147: compiler warning when building with Python 3.7

Problem:    Compiler warning when building with Python 3.7.
Solution:   #undef PySlice_GetIndicesEx before redefining it. (Ozaki Kiichi,
            closes #3153)

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    147,
 /**/
     146,
 /**/