[BUILD] fix a minor build warning on AIX
AIX wants string.h in signal.c (and is right to do so) :
gcc -Iinclude -Wall -O2 -g -DTPROXY -DENABLE_POLL -DCONFIG_HAPROXY_VERSION=\"1.3.18\" -DCONFIG_HAPROXY_DATE=\"2009/05/10\" -c -o src/signal.o src/signal.c
src/signal.c: In function 'signal_init':
src/signal.c:32: warning: implicit declaration of function 'memset'
src/signal.c:32: warning: incompatible implicit declaration of built-in function 'memset'
diff --git a/src/signal.c b/src/signal.c
index 7de17ab..9825c0d 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -11,6 +11,8 @@
*/
#include <signal.h>
+#include <string.h>
+
#include <proto/signal.h>
#include <proto/log.h>