[gtk+/gtk-3-4] Bug 670499-gtk/fallback-c89.c: Add fallback for nearbyint()

[Chun-wei Fan <fanchunwei src gnome org>]

commit 8813a71b369023282b8a7c27ae429e9691a75da4
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Apr 5 22:55:15 2012 +0800

    Bug 670499-gtk/fallback-c89.c: Add fallback for nearbyint()
    
    This adds a C89 implementation for nearbyint() as it is a function that
    is only made available in C99.

 gtk/fallback-c89.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/gtk/fallback-c89.c b/gtk/fallback-c89.c
index eb713b8..aaccd9d 100644
--- a/gtk/fallback-c89.c
+++ b/gtk/fallback-c89.c
@@ -53,4 +53,15 @@ rint (double x)
       return ceil (x - 0.5);
   }
 }
-#endif
\ No newline at end of file
+#endif
+
+#ifndef HAVE_NEARBYINT
+/* Workaround for nearbyint() for non-GCC/non-C99 compilers */
+/* This is quite similar to rint() in most respects */
+
+static inline double
+nearbyint (double x)
+{
+  return floor (x + 0.5);
+}
+#endif