patch 8.1.0724: build for MinGW fails

Problem:    Build for MinGW fails.
Solution:   Avoid specifying dependencies in included makefile.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index a1a344e..8db2995 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -407,9 +407,3 @@
 	test_alot_latin.res \
 	test_alot_utf8.res \
 	test_alot.res
-
-
-# Explicit dependencies.
-test49.out: test49.vim
-
-test_options.res test_alot.res: opt_test.vim
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 2623fb1..5776a79 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -132,5 +132,7 @@
 	$(VIMPROG) -u gui_preinit.vim -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $*.vim
 	@del vimcmd
 
+test_options.res test_alot.res: opt_test.vim
+
 opt_test.vim: ../option.c gen_opt_test.vim
 	$(VIMPROG) -u NONE -S gen_opt_test.vim --noplugin --not-a-term ../option.c
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 2fa3e78..a2e586f 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -127,5 +127,7 @@
 	$(VIMPROG) -u gui_preinit.vim -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $<
 	@$(DEL) vimcmd
 
+test_options.res test_alot.res: opt_test.vim
+
 opt_test.vim: ../option.c gen_opt_test.vim
 	$(VIMPROG) -u NONE -S gen_opt_test.vim --noplugin --not-a-term ../option.c
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 311701a..c3ba8ab 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -33,6 +33,11 @@
 	  $(SCRIPTS_MORE2) \
 	  $(SCRIPTS_MORE4)
 
+# Explicit dependencies.
+test49.out: test49.vim
+
+test_options.res test_alot.res: opt_test.vim
+
 SCRIPTS_BENCH = bench_re_freeze.out
 
 .SUFFIXES: .in .out .res .vim
diff --git a/src/version.c b/src/version.c
index aede1e6..50b3263 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    724,
+/**/
     723,
 /**/
     722,