patch 9.1.0024: z/OS (MVS) support can be improved

Problem:  z/OS (MVS) support can be improved
Solution: set UTF-8 as the default encoding for z/OS

closes: #13821

Signed-off-by: Igor Todorovski <itodorov@ca.ibm.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/option.c

@@ -450,9 +450,10 @@ set_init_default_encoding(void)
     char_u	*p;
     int		opt_idx;
 
-# ifdef MSWIN
+# if defined(MSWIN) || defined(__MVS__)
     // MS-Windows has builtin support for conversion to and from Unicode, using
     // "utf-8" for 'encoding' should work best for most users.
+    // z/OS built should default to UTF-8 mode as setlocale does not respect utf-8 environment variable locales
     p = vim_strsave((char_u *)ENC_DFLT);
 # else
     // enc_locale() will try to find the encoding of the current locale.

src/option.h

@@ -130,7 +130,7 @@ typedef enum {
 #define ENC_UCSBOM	"ucs-bom"	// check for BOM at start of file
 
 // default value for 'encoding'
-#ifdef MSWIN
+#if defined(MSWIN) || defined(__MVS__)
 # define ENC_DFLT	"utf-8"
 #else
 # define ENC_DFLT	"latin1"

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    24,
 /**/
     23,
 /**/