Remove mblen() check

src/buffer.c

@@ -4364,7 +4364,6 @@ int find_win_for_buf(buf_T *buf, win_T **wp, tabpage_T **tp)
 win_found:
   return OK;
 }
-#endif
 
 /*
  * Insert the sign into the signlist.

src/charset.c

@@ -1666,8 +1666,7 @@ char_u* skiptowhite(char_u *p)
 /// @param p
 ///
 /// @return Pointer to the next whitespace character.
-char_u* skiptowhite_esc(char_u *p)
-{
+char_u* skiptowhite_esc(char_u *p) {
   while (*p != ' ' && *p != '\t' && *p != NUL) {
     if (((*p == '\\') || (*p == Ctrl_V)) && (*(p + 1) != NUL)) {
       ++p;

src/ex_docmd.c

@@ -119,7 +119,6 @@ static linenr_T get_address(char_u **, int skip, int to_other_file);
 static void get_flags(exarg_T *eap);
 # define HAVE_EX_SCRIPT_NI
 static void ex_script_ni(exarg_T *eap);
-#endif
 static char_u   *invalid_range(exarg_T *eap);
 static void correct_range(exarg_T *eap);
 static char_u   *replace_makeprg(exarg_T *eap, char_u *p,

src/mbyte.c

@@ -526,14 +526,6 @@ char_u * mb_init()
     else if (enc_dbcs == 0)
       n = 1;
     else {
-# if defined(MACOS)
-      /*
-       * if mblen() is not available, character which MSB is turned on
-       * are treated as leading byte character. (note : This assumption
-       * is not always true.)
-       */
-      n = (i & 0x80) ? 2 : 1;
-# else
       char buf[MB_MAXBYTES + 1];
       if (i == NUL)             /* just in case mblen() can't handle "" */
         n = 1;
@@ -568,9 +560,7 @@ char_u * mb_init()
             n = 1;
         }
       }
-# endif
     }
-
     mb_bytelen_tab[i] = n;
   }