Remove duplicate sys/prctl.h configure check. Wrap another include in HAVE_SYS_PRCTL_H.

configure.in

@@ -91,12 +91,9 @@ AC_INIT(configure.in)
 
 # Checks for header files.
     AC_CHECK_HEADERS([arpa/inet.h inttypes.h limits.h netdb.h poll.h signal.h stdint.h stdlib.h string.h syslog.h sys/ioctl.h sys/prctl.h sys/socket.h sys/syscall.h netinet/in.h sys/time.h unistd.h windows.h winsock2.h ws2tcpip.h])
-   AC_CHECK_HEADERS([sys/socket.h net/if.h sys/prctl.h], [], [],
+   AC_CHECK_HEADERS([sys/socket.h net/if.h], [], [],
     [[#ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
-#endif
-#ifdef HAVE_SYS_PRCTL_H
-#include <sys/prctl.h>
 #endif
     ]])
 

src/util-privs.c

@@ -35,7 +35,9 @@
 #ifdef HAVE_LIBCAP_NG
 
 #include <cap-ng.h>
+#ifdef HAVE_SYS_PRCTL_H
 #include <sys/prctl.h>
+#endif
 #include "threadvars.h"
 #include "util-cpu.h"
 #include "util-privs.h"