patch 9.1.0637: MS-Windows: Style issues in MSVC Makefile

Problem:  MS-Windows: Style issues in MSVC Makefile
Solution: Fix style issues, simplify logic
          (Ken Takata)

* Add space around the operators for consistency.
* Remove unnecessary ren command. Use the /Fe option to create
  install.exe directly.
* Remove unnecessary mkdir auto command. src/auto should always exist.

closes: #15389

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/Make_mvc.mak

@@ -960,12 +960,10 @@ LUA_LIB = "$(LUA)\lib\lua$(LUA_VER).lib"
 ! endif
 !endif
 
-!ifdef PYTHON
-! ifdef PYTHON3
+!if defined(PYTHON) && defined(PYTHON3)
 DYNAMIC_PYTHON = yes
 DYNAMIC_PYTHON3 = yes
 !endif
-!endif
 
 # PYTHON interface
 !ifdef PYTHON
@@ -1348,11 +1346,9 @@ CFLAGS_INST=	$(CFLAGS_INST) -DVIM_VERSION_PATCHLEVEL=$(PATCHLEVEL)
 !ENDIF
 
 install.exe: dosinst.c dosinst.h version.h
-	$(CC) $(CFLAGS_INST) dosinst.c kernel32.lib shell32.lib \
+	$(CC) $(CFLAGS_INST) /Fe$@ dosinst.c kernel32.lib shell32.lib \
 		user32.lib ole32.lib advapi32.lib uuid.lib \
 		-link -subsystem:$(SUBSYSTEM_TOOLS)
-	- if exist install.exe del install.exe
-	ren dosinst.exe install.exe
 
 uninstall.exe: uninstall.c dosinst.h version.h
 	$(CC) $(CFLAGS_INST) uninstall.c shell32.lib advapi32.lib \
@@ -1632,7 +1628,6 @@ $(OUTDIR)/if_lua.obj: $(OUTDIR) if_lua.c  $(INCL)
 	$(CC) $(CFLAGS_OUTDIR) $(LUA_INC) if_lua.c
 
 auto/if_perl.c: if_perl.xs typemap
-	-if not exist auto/nul mkdir auto
 	$(XSUBPP) -prototypes -typemap $(XSUBPP_TYPEMAP) \
 		-typemap typemap if_perl.xs -output $@
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    637,
 /**/
     636,
 /**/