patch 8.1.1381: MS-Windows: missing build dependency

Problem:    MS-Windows: missing build dependency.
Solution:   Make gui_dwrite.cpp depend on gui_dwrite.h. (Ken Takata,
            closes #4423
diff --git a/src/version.c b/src/version.c
index f7fb44e..2401cc2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1381,
+/**/
     1380,
 /**/
     1379,