patch 8.2.5066: timer_create is not available on every Mac system

Problem:    Timer_create is not available on every Mac system. (Hisashi T
            Fujinaka)
Solution:   Adjust #ifdef.
diff --git a/src/screen.c b/src/screen.c
index 29ccd3e..5035879 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -4831,11 +4831,13 @@
     char *
 set_chars_option(win_T *wp, char_u **varp)
 {
-    int		round, i, len, entries;
+    int		round, i, len, len2, entries;
     char_u	*p, *s;
     int		c1 = 0, c2 = 0, c3 = 0;
     char_u	*last_multispace = NULL; // Last occurrence of "multispace:"
+    char_u	*last_lmultispace = NULL; // Last occurrence of "leadmultispace:"
     int		multispace_len = 0;	 // Length of lcs-multispace string
+    int		lead_multispace_len = 0; // Length of lcs-leadmultispace string
     struct charstab
     {
 	int	*cp;
@@ -4909,6 +4911,14 @@
 		}
 		else
 		    lcs_chars.multispace = NULL;
+
+		if (lead_multispace_len > 0)
+		{
+		    lcs_chars.leadmultispace = ALLOC_MULT(int, lead_multispace_len + 1);
+		    lcs_chars.leadmultispace[lead_multispace_len] = NUL;
+		}
+		else
+		    lcs_chars.leadmultispace = NULL;
 	    }
 	    else
 	    {
@@ -4972,6 +4982,7 @@
 	    if (i == entries)
 	    {
 		len = (int)STRLEN("multispace");
+		len2 = (int)STRLEN("leadmultispace");
 		if ((varp == &p_lcs || varp == &wp->w_p_lcs)
 			&& STRNCMP(p, "multispace", len) == 0
 			&& p[len] == ':'
@@ -5008,6 +5019,43 @@
 			p = s;
 		    }
 		}
+
+		else if ((varp == &p_lcs || varp == &wp->w_p_lcs)
+			&& STRNCMP(p, "leadmultispace", len2) == 0
+			&& p[len2] == ':'
+			&& p[len2 + 1] != NUL)
+		{
+		    s = p + len2 + 1;
+		    if (round == 0)
+		    {
+			// Get length of lcsmultispace string in first round
+			last_lmultispace = p;
+			lead_multispace_len = 0;
+			while (*s != NUL && *s != ',')
+			{
+			    c1 = get_encoded_char_adv(&s);
+			    if (char2cells(c1) > 1)
+				return e_invalid_argument;
+			    ++lead_multispace_len;
+			}
+			if (lead_multispace_len == 0)
+			    // lcsmultispace cannot be an empty string
+			    return e_invalid_argument;
+			p = s;
+		    }
+		    else
+		    {
+			int multispace_pos = 0;
+
+			while (*s != NUL && *s != ',')
+			{
+			    c1 = get_encoded_char_adv(&s);
+			    if (p == last_lmultispace)
+				lcs_chars.leadmultispace[multispace_pos++] = c1;
+			}
+			p = s;
+		    }
+		}
 		else
 		    return e_invalid_argument;
 	    }
@@ -5020,6 +5068,8 @@
     {
 	if (wp->w_lcs_chars.multispace != NULL)
 	    vim_free(wp->w_lcs_chars.multispace);
+	if (wp->w_lcs_chars.leadmultispace != NULL)
+	    vim_free(wp->w_lcs_chars.leadmultispace);
 	wp->w_lcs_chars = lcs_chars;
     }