utils: define _GNU_SOURCE to get clearenv()

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/utils.c b/utils.c
index 66c1865..7e5ae45 100644 (file)
--- a/utils.c
+++ b/utils.c
@@ -16,6 +16,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#define _GNU_SOURCE
 #include "utils.h"
 #include "options.h"