patch 7.4.1872
Problem:    Still build problem with old version of Perl.
Solution:   Also define SvREFCNT_inc_void_NN if needed. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 3340537..b87300a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1872,
+/**/
     1871,
 /**/
     1870,