[chronojump] Add UNIX define for Linux and OS X

[Andoni Morales Alastruey <amorales src gnome org>]

commit 4291c6d4391b3d638f0dcc225b2c8a63794815dc
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Mon Oct 14 17:41:40 2013 +0200

    Add UNIX define for Linux and OS X

 rdotnet/RDotNet.NativeLibrary/Makefile.am |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/rdotnet/RDotNet.NativeLibrary/Makefile.am b/rdotnet/RDotNet.NativeLibrary/Makefile.am
index a106b66..f5edd76 100644
--- a/rdotnet/RDotNet.NativeLibrary/Makefile.am
+++ b/rdotnet/RDotNet.NativeLibrary/Makefile.am
@@ -8,4 +8,8 @@ SOURCES = \
     UnmanagedDll.cs \
     NativeUtility.cs
 
+if !OSTYPE_WINDOWS
+ASSEMBLY_BUILD_FLAGS = -define:UNIX
+endif
+
 include $(top_srcdir)/build/build.mk