[gtk+] Add GDK_AVAILABLE_IN_3_90

[Richard Hughes <rhughes src gnome org>]

commit 13e00b70c08d85750784ea014080d1ce52604dac
Author: Richard Hughes <richard hughsie com>
Date:   Wed Sep 28 14:14:02 2016 +0100

    Add GDK_AVAILABLE_IN_3_90

 gdk/gdkversionmacros.h.in |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkversionmacros.h.in b/gdk/gdkversionmacros.h.in
index bc2365d..a42a34b 100644
--- a/gdk/gdkversionmacros.h.in
+++ b/gdk/gdkversionmacros.h.in
@@ -172,6 +172,16 @@
  */
 #define GDK_VERSION_3_22        (G_ENCODE_VERSION (3, 22))
 
+/**
+ * GDK_VERSION_3_90:
+ *
+ * A macro that evaluates to the 3.90 version of GDK, in a format
+ * that can be used by the C pre-processor.
+ *
+ * Since: 3.90
+ */
+#define GDK_VERSION_3_90        (G_ENCODE_VERSION (3, 90))
+
 /* evaluates to the current stable version; for development cycles,
  * this means the next stable target
  */
@@ -412,5 +422,11 @@
 # define GDK_AVAILABLE_IN_3_22                _GDK_EXTERN
 #endif
 
+#if GDK_VERSION_MAX_ALLOWED < GDK_VERSION_3_90
+# define GDK_AVAILABLE_IN_3_90                GDK_UNAVAILABLE(3, 90)
+#else
+# define GDK_AVAILABLE_IN_3_90                _GDK_EXTERN
+#endif
+
 #endif  /* __GDK_VERSION_MACROS_H__ */