patch 8.0.0144: when using MSVC the GvimExt directory is cleaned twice

Problem:    When using MSVC the GvimExt directory is cleaned twice.
Solution:   Remove the lines. (Ken Takata)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 5160aeb..f1ecbe0 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -1123,9 +1123,6 @@
 	cd GvimExt
 	$(MAKE) /NOLOGO -f Makefile clean
 	cd ..
-	cd GvimExt
-	$(MAKE) /NOLOGO -f Makefile clean
-	cd ..
 	- if exist testdir\*.out del testdir\*.out
 
 test:
diff --git a/src/version.c b/src/version.c
index d4224cb..78717e1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    144,
+/**/
     143,
 /**/
     142,