[evolution] Replace _BSD_SOURCE with _DEFAULT_SOURCE define

[Milan Crha <mcrha src gnome org>]

commit de4f0e8130819b91465f78d4af82ba88fdc3e1fb
Author: Milan Crha <mcrha redhat com>
Date:   Mon Feb 2 18:03:28 2015 +0100

    Replace _BSD_SOURCE with _DEFAULT_SOURCE define
    
    To avoid compiler warning:
    /usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use 
_DEFAULT_SOURCE" [-Wcpp]
     # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

 libgnomecanvas/gnome-canvas-util.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgnomecanvas/gnome-canvas-util.c b/libgnomecanvas/gnome-canvas-util.c
index 74ee32a..76b2c0a 100644
--- a/libgnomecanvas/gnome-canvas-util.c
+++ b/libgnomecanvas/gnome-canvas-util.c
@@ -34,8 +34,8 @@
 #endif
 
 /* needed for M_PI_2 under 'gcc -ansi -predantic' on GNU/Linux */
-#ifndef _BSD_SOURCE
-#  define _BSD_SOURCE 1
+#ifndef _DEFAULT_SOURCE
+#  define _DEFAULT_SOURCE 1
 #endif
 #include <sys/types.h>