patch 8.1.0941: macros for MS-Windows are inconsistent

Problem:    Macros for MS-Windows are inconsistent, using "32", "3264 and
            others.
Solution:   Use MSWIN for all MS-Windows builds.  Use FEAT_GUI_MSWIN for the
            GUI build. (Hirohito Higashi, closes #3932)
diff --git a/src/version.c b/src/version.c
index e042578..5ffbc56 100644
--- a/src/version.c
+++ b/src/version.c
@@ -222,7 +222,7 @@
 #else
 	"-digraphs",
 #endif
-#ifdef FEAT_GUI_W32
+#ifdef FEAT_GUI_MSWIN
 # ifdef FEAT_DIRECTX
 	"+directx",
 # else
@@ -481,7 +481,7 @@
 #else
 	"-num64",
 #endif
-#ifdef FEAT_GUI_W32
+#ifdef FEAT_GUI_MSWIN
 # ifdef FEAT_OLE
 	"+ole",
 # else
@@ -700,7 +700,7 @@
 	"-viminfo",
 #endif
 	"+vreplace",
-#ifdef WIN3264
+#ifdef MSWIN
 # ifdef FEAT_VTP
 	"+vtp",
 # else
@@ -740,7 +740,7 @@
 #else
 	"-xim",
 #endif
-#ifdef WIN3264
+#ifdef MSWIN
 # ifdef FEAT_XPM_W32
 	"+xpm_w32",
 # else
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    941,
+/**/
     940,
 /**/
     939,
@@ -2852,16 +2854,16 @@
      */
     init_longVersion();
     msg(longVersion);
-#ifdef WIN3264
-# ifdef FEAT_GUI_W32
+#ifdef MSWIN
+# ifdef FEAT_GUI_MSWIN
 #  ifdef _WIN64
     msg_puts(_("\nMS-Windows 64-bit GUI version"));
 #  else
     msg_puts(_("\nMS-Windows 32-bit GUI version"));
 #  endif
-# ifdef FEAT_OLE
+#  ifdef FEAT_OLE
     msg_puts(_(" with OLE support"));
-# endif
+#  endif
 # else
 #  ifdef _WIN64
     msg_puts(_("\nMS-Windows 64-bit console version"));