patch 9.0.0421: MS-Windows makefiles are inconsistently named

Problem:    MS-Windows makefiles are inconsistently named.
Solution:   Use consistent names. (Ken Takata, closes #11088)
diff --git a/src/tee/Make_ming.mak b/src/tee/Make_ming.mak
new file mode 100644
index 0000000..f6e9135
--- /dev/null
+++ b/src/tee/Make_ming.mak
@@ -0,0 +1,21 @@
+# A very (if not the most) simplistic Makefile for MS-Windows and OS/2
+
+CC=gcc
+CFLAGS=-O2 -fno-strength-reduce
+
+ifneq (sh.exe, $(SHELL))
+DEL = rm -f
+else
+DEL = del
+endif
+
+tee.exe: tee.o
+	$(CC) $(CFLAGS) -s -o $@ $<
+
+tee.o: tee.c
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	- $(DEL) tee.o
+	- $(DEL) tee.exe
+
diff --git a/src/tee/Makefile b/src/tee/Makefile
index f6e9135..fe77779 100644
--- a/src/tee/Makefile
+++ b/src/tee/Makefile
@@ -1,21 +1,2 @@
-# A very (if not the most) simplistic Makefile for MS-Windows and OS/2
-
-CC=gcc
-CFLAGS=-O2 -fno-strength-reduce
-
-ifneq (sh.exe, $(SHELL))
-DEL = rm -f
-else
-DEL = del
-endif
-
-tee.exe: tee.o
-	$(CC) $(CFLAGS) -s -o $@ $<
-
-tee.o: tee.c
-	$(CC) $(CFLAGS) -c $<
-
-clean:
-	- $(DEL) tee.o
-	- $(DEL) tee.exe
-
+$(warning This makefile is deprecated. Use Make_ming.mak instead.)
+include Make_ming.mak