[gegl] Fix typo: G_OS_WIN_32 -> G_OS_WIN32

[Michael Schumacher <schumaml src gnome org>]

commit 9a6d830a812d85e7a8d5852d4058d2c29ee87dc0
Author: Michael Schumacher <schumaml gmx de>
Date:   Sat Nov 21 23:29:27 2009 +0100

    Fix typo: G_OS_WIN_32 -> G_OS_WIN32

 gegl/buffer/gegl-buffer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer.c b/gegl/buffer/gegl-buffer.c
index 9903246..07b2b2b 100644
--- a/gegl/buffer/gegl-buffer.c
+++ b/gegl/buffer/gegl-buffer.c
@@ -76,7 +76,7 @@
 /* #define GEGL_BUFFER_DEBUG_ALLOCATIONS to print allocation stack
  * traces for leaked GeglBuffers using GNU C libs backtrace_symbols()
  */
-#ifndef G_OS_WIN_32
+#ifndef G_OS_WIN32
 #include <execinfo.h>
 #endif