patch 8.0.0888: compiler warnings with 64 bit build

Problem:    Compiler warnings with 64 bit build.
Solution:   Add type cast of change the type. (Mike Williams)

src/message.c

@@ -2639,7 +2639,7 @@ msg_puts_printf(char_u *str, int maxlen)
 # if defined(FEAT_MBYTE) && !defined(FEAT_GUI_MSWIN)
     if (enc_codepage >= 0 && (int)GetConsoleCP() != enc_codepage)
     {
-	int	inlen = STRLEN(str);
+	int	inlen = (int)STRLEN(str);
 	int	outlen;
 	WCHAR	*widestr = (WCHAR *)enc_to_utf16(str, &inlen);
 

src/os_mswin.c

@@ -453,8 +453,9 @@ slash_adjust(char_u *p)
 
     if (*p == '`')
     {
+	size_t len = STRLEN(p);
+
 	/* don't replace backslash in backtick quoted strings */
-	int len = STRLEN(p);
 	if (len > 2 && *(p + len - 1) == '`')
 	    return;
     }

src/os_win32.c

@@ -7031,7 +7031,8 @@ fix_arg_enc(void)
 	     * main.c, so this part add str as literal. */
 	    if (literal == FALSE)
 	    {
-		int len = STRLEN(str);
+		size_t len = STRLEN(str);
+
 		if (len > 2 && *str == '`' && *(str + len - 1) == '`')
 		    literal = TRUE;
 	    }

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    888,
 /**/
     887,
 /**/