patch 8.1.1398: duplicate line in MSVC build file

Problem:    Duplicate line in MSVC build file.
Solution:   Remove the line. (Ken Takata, closes #4436)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index c1cd0a4..c6f9b25 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -744,7 +744,6 @@
 	$(OUTDIR)\pathdef.obj \
 	$(OUTDIR)\popupmnu.obj \
 	$(OUTDIR)\popupwin.obj \
-	$(OUTDIR)\popupwin.obj \
 	$(OUTDIR)\quickfix.obj \
 	$(OUTDIR)\regexp.obj \
 	$(OUTDIR)\screen.obj \
diff --git a/src/version.c b/src/version.c
index 0e7f14d..8cfb965 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1398,
+/**/
     1397,
 /**/
     1396,