patch 8.1.0801: MinGW: no hint that tests fail because of small terminal

Problem:    MinGW: no hint that tests fail because of small terminal.
Solution:   Add a rule for test1 that checks for "wrongtermsize".
            (msoyka-of-wharton)

src/testdir/Make_ming.mak

@@ -84,6 +84,15 @@ clean:
 	-@if exist messages $(DEL) messages
 	-@if exist opt_test.vim $(DEL) opt_test.vim
 
+test1.out: test1.in
+	-@if exist wrongtermsize  $(DEL) wrongtermsize
+	$(VIMPROG) -u dos.vim $(NO_INITS) -s dotest.in test1.in
+	-@if exist wrongtermsize  ( \
+	    echo Vim window too small- must be 80x25 or larger && exit 1 \
+	    )
+	-@if exist test.out $(DEL) test.out
+	-@if exist viminfo  $(DEL) viminfo
+
 .in.out:
 	-@if exist $*.ok $(CP) $*.ok test.ok
 	$(VIMPROG) -u dos.vim $(NO_INITS) -s dotest.in $*.in

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    801,
 /**/
     800,
 /**/