Add missing headers for DragonFly BSD

Author: rtzoeller

libc-test/build.rs

@@ -1176,8 +1176,10 @@ fn test_dragonflybsd(target: &str) {
         "ifaddrs.h",
         "langinfo.h",
         "limits.h",
+        "link.h",
         "locale.h",
         "mqueue.h",
+        "net/bpf.h",
         "net/if.h",
         "net/if_arp.h",
         "net/if_dl.h",
@@ -1206,8 +1208,10 @@ fn test_dragonflybsd(target: &str) {
         "sys/ioctl.h",
         "sys/ipc.h",
         "sys/ktrace.h",
+        "sys/malloc.h",
         "sys/mman.h",
         "sys/mount.h",
+        "sys/procctl.h",
         "sys/ptrace.h",
         "sys/resource.h",
         "sys/rtprio.h",
@@ -1219,6 +1223,7 @@ fn test_dragonflybsd(target: &str) {
         "sys/sysctl.h",
         "sys/time.h",
         "sys/times.h",
+        "sys/timex.h",
         "sys/types.h",
         "sys/uio.h",
         "sys/un.h",