[patch] Fix ns-antialias-text in Mac OS for 24.4

[Scott Wheeler <scott.wheeler@gmx.de>]

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Hi fellows —

In the recent release ns-antialias-text / mac-allow-anti-aliasing were broken for Mac (they have no effect).  I did a binary search through the commits until I pinned it on this and the following commit:

https://gitorious.org/emacs-transition/review6/commit/61cf50507d6564d741c0ec399b6a33fa248669a5

The patch was very simple — it just needs to check the setting again, and is attached for review.

-Scott


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commit 6ee23077cee8f619edd4c4ffccfdbcf976da6866
Author: Scott Wheeler <scott@directededge.com>
Date:   Thu Oct 23 03:13:14 2014 +0200

    Check to see if the user has explicitly disabled anti-aliasing

diff --git a/src/macfont.m b/src/macfont.m
index 1bb3fb1..55b9a9f 100644
--- a/src/macfont.m
+++ b/src/macfont.m
@@ -2763,7 +2763,8 @@ macfont_draw (struct glyph_string *s, int from, int to, int x, int y,
       CGFloat advance_delta = 0;
       int y_draw = -s->ybase;
       int no_antialias_p =
-	(macfont_info->antialias == MACFONT_ANTIALIAS_OFF
+	(NILP (ns_antialias_text)
+         || macfont_info->antialias == MACFONT_ANTIALIAS_OFF
 	 || (macfont_info->antialias == MACFONT_ANTIALIAS_DEFAULT
 	     && font_size <= macfont_antialias_threshold));