patch 9.1.0656: MS-Windows: MSVC Makefile CPU handling can be improved

Problem:  MS-Windows: MSVC Makefile CPU handling can be improved
Solution: Update Makefile and also remove some old code
          (Ken Takata)

* The variable `ASSEMBLY_ARCHITECTURE` was originally used to generate
  the manifest file. However, this was removed in v7.0.198.  Remove
  `ASSEMBLY_ARCHITECTURE` and use `CPU` instead.
* `/arch:AVX512` is available starting from Visual C++ 2017.
* ARM64 was not considered when validating CPUNR.
  Skip the validation for ARM64 for now.
* Remove old code for VC6/7 and Win9x.

closes: #15422

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index a9fae00..4a985b9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    656,
+/**/
     655,
 /**/
     654,