patch 7.4.1848

Problem:    Can't build with Strawberry Perl 5.24.
Solution:   Define S_SvREFCNT_dec() if needed. (Damien, Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1848,
 /**/
     1847,
 /**/