Move feature test macros to config.h

I removed most of the *BSD-related stuff, because I can’t test these. If
this breaks your build, send me a patch please.

1 files changed, 1 insertions, 5 deletions

diff --git a/src/ui.c b/src/ui.c
index 91eb005..779dbf8 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -23,11 +23,7 @@ THE SOFTWARE.
 
 /* everything that interacts with the user */
 
-#ifndef __FreeBSD__
-#define _POSIX_C_SOURCE 1 /* fileno() */
-#define _BSD_SOURCE /* strdup() */
-#define _DARWIN_C_SOURCE /* strdup() on OS X */
-#endif
+#include "config.h"
 
 #include <stdio.h>
 #include <stdarg.h>