[clutter/clutter-1.18] Use _CLUTTER_EXTERN to define CLUTTER_VAR

[Emmanuele Bassi <ebassi src gnome org>]

commit 3b21999494a7196f1d3c7d5297d4abed39a98ec7
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Mar 17 18:43:08 2014 +0000

    Use _CLUTTER_EXTERN to define CLUTTER_VAR
    
    The macro is defined outside of the header, and does all the heavy
    lifting of getting the proper attributes.

 clutter/clutter-version.h.in |   17 ++++-------------
 1 files changed, 4 insertions(+), 13 deletions(-)
---
diff --git a/clutter/clutter-version.h.in b/clutter/clutter-version.h.in
index a308920..0afdc70 100644
--- a/clutter/clutter-version.h.in
+++ b/clutter/clutter-version.h.in
@@ -254,21 +254,12 @@ G_BEGIN_DECLS
          (CLUTTER_MAJOR_VERSION == (major) && CLUTTER_MINOR_VERSION > (minor)) || \
          (CLUTTER_MAJOR_VERSION == (major) && CLUTTER_MINOR_VERSION == (minor) && CLUTTER_MICRO_VERSION >= 
(micro)))
 
-/* annotation for exported variables
- *
- * XXX: this has to be defined here because clutter-macro.h imports this
- * header file.
- */
-#ifdef _MSC_VER
-# ifdef CLUTTER_COMPILATION
-#  define CLUTTER_VAR __declspec(dllexport)
-# else
-#  define CLUTTER_VAR extern __declspec(dllimport)
-# endif
-#else
-# define CLUTTER_VAR extern
+#ifndef _CLUTTER_EXTERN
+#define _CLUTTER_EXTERN extern
 #endif
 
+#define CLUTTER_VAR _CLUTTER_EXTERN
+
 /**
  * clutter_major_version:
  *