fix excessive correction of bounding

Commit 69984fb extended glyph bounding boxes in the wrong
(pre-scaled) coordinate system.

racket/src/native-libs/patches/cairo-coretext.patch

@@ -1,21 +1,14 @@
 diff -r -u old/cairo-1.12.16/src/cairo-quartz-font.c new/cairo-1.12.16/src/cairo-quartz-font.c
---- old/cairo-1.12.16/src/cairo-quartz-font.c	2014-04-15 11:04:35.000000000 -0600
-+++ new/cairo-1.12.16/src/cairo-quartz-font.c	2014-04-15 11:05:43.000000000 -0600
-@@ -461,10 +461,12 @@
- 	     bbox.size.width / emscale, bbox.size.height / emscale);
- #endif
+--- old/cairo-1.12.16/src/cairo-quartz-font.c	2014-04-15 13:39:14.000000000 -0600
++++ new/cairo-1.12.16/src/cairo-quartz-font.c	2014-04-15 14:39:00.000000000 -0600
+@@ -440,7 +440,9 @@
+ 		       bbox.size.height / emscale);
 
--    xmin = CGRectGetMinX(bbox);
--    ymin = CGRectGetMinY(bbox);
--    xmax = CGRectGetMaxX(bbox);
--    ymax = CGRectGetMaxY(bbox);
-+    /* add 1 to bounds to avoid round-off error that happens somewhere
-+       in the path of rendering text (e.g., "-" vs. "-d" with 12-point Menlo) */
-+    xmin = CGRectGetMinX(bbox)-1;
-+    ymin = CGRectGetMinY(bbox)-1;
-+    xmax = CGRectGetMaxX(bbox)+1;
-+    ymax = CGRectGetMaxY(bbox)+1;
-
-     extents.x_bearing = xmin;
-     extents.y_bearing = - ymax;
-
+     /* Should we want to always integer-align glyph extents, we can do so in this way */
+-#if 0
++    /* Do so to avoid round-off error that happens somewhere in the path of rendering
++       text (e.g., "-" vs. "-d" with 12-point Menlo) */
++#if 1
+     {
+ 	CGAffineTransform textMatrix;
+ 	textMatrix = CGAffineTransformMake (font->base.scale.xx,