Removed feature test macro definitions from source files

commands.c

@@ -16,9 +16,6 @@
  * along with sxiv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _POSIX_C_SOURCE 200112L
-#define _IMAGE_CONFIG
-
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -29,6 +26,8 @@
 #include "options.h"
 #include "thumbs.h"
 #include "util.h"
+
+#define _IMAGE_CONFIG
 #include "config.h"
 
 void cleanup(void);