[pango] Fix a few warnings

[Behdad Esfahbod <behdad src gnome org>]

commit d0ae2a4b74903331e8b79968faf2af95e012ef65
Author: Behdad Esfahbod <behdad behdad org>
Date:   Tue May 5 17:17:04 2015 -0700

    Fix a few warnings

 pango/pango-gravity.c |    1 -
 pango/pango-layout.c  |    2 +-
 pango/pango-utils.c   |    2 +-
 pango/pangofc-shape.c |    2 --
 4 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/pango/pango-gravity.c b/pango/pango-gravity.c
index ebaf17e..8565db1 100644
--- a/pango/pango-gravity.c
+++ b/pango/pango-gravity.c
@@ -186,7 +186,6 @@ typedef struct {
 
 #define S PANGO_GRAVITY_SOUTH
 #define E PANGO_GRAVITY_EAST
-#define N PANGO_GRAVITY_NORTH
 #define W PANGO_GRAVITY_WEST
 
 const PangoScriptProperties script_properties[] =
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index 1c844ab..c982041 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -1312,7 +1312,7 @@ pango_layout_get_unknown_glyphs_count (PangoLayout *layout)
 static void
 check_context_changed (PangoLayout *layout)
 {
-  int old_serial = layout->context_serial;
+  guint old_serial = layout->context_serial;
 
   layout->context_serial = pango_context_get_serial (layout->context);
 
diff --git a/pango/pango-utils.c b/pango/pango-utils.c
index 61c76ad..eb01fa6 100644
--- a/pango/pango-utils.c
+++ b/pango/pango-utils.c
@@ -984,7 +984,7 @@ _pango_shape_shape (const char       *text,
                    PangoRectangle   *shape_logical,
                    PangoGlyphString *glyphs)
 {
-  int i;
+  unsigned int i;
   const char *p;
 
   pango_glyph_string_set_size (glyphs, n_chars);
diff --git a/pango/pangofc-shape.c b/pango/pangofc-shape.c
index 3a2cfa4..f0ea784 100644
--- a/pango/pangofc-shape.c
+++ b/pango/pangofc-shape.c
@@ -31,8 +31,6 @@
 #include <hb-ft.h>
 #include <hb-glib.h>
 
-#define PANGO_UNITS_26_6(d)    ((d) << 4)
-
 /* cache a single hb_buffer_t */
 static hb_buffer_t *cached_buffer = NULL; /* MT-safe */
 G_LOCK_DEFINE_STATIC (cached_buffer);