patch 8.0.1739: MS-Windows with msys2 cannot build Ruby statically

Problem:    MS-Windows with msys2 cannot build Ruby statically.
Solution:   Define RUBY_VERSION. (Gray Wolf, closes #2826)
diff --git a/src/version.c b/src/version.c
index 2b5bf04..a73994b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1739,
+/**/
     1738,
 /**/
     1737,