patch 8.2.1675: MinGW: testdir makefile deletes non-existing file

Problem:    MinGW: testdir makefile deletes non-existing file.
Solution:   Use another way to delete the output file if it already exists.
            (Michael Soyka)

src/testdir/Make_ming.mak

@@ -95,7 +95,7 @@ tinytests: $(SCRIPTS_TINY_OUT)
 # Copy the input files to dostmp, changing the fileformat to dos.
 $(DOSTMP)/%.in : %.in
 	if not exist $(DOSTMP)\nul mkdir $(DOSTMP)
-	if not exist $@ $(DEL) $@
+	if exist $(DOSTMP)\$< $(DEL) $(DOSTMP)\$<
 	$(VIMPROG) -u dos.vim $(NO_INITS) "+set ff=dos|f $@|wq" $<
 
 # For each input file dostmp/test99.in run the tests.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1675,
 /**/
     1674,
 /**/