Merge pull request #54 from rosslagerwall/configure-dup

Remove unnecessary code in configure.in.

diff --cc configure.in
index 1c649a235b0dc9ee94ac02730f073adba61f6320,3faa99c76557a7c649359a4c2694cf5b8a26830a..f1972bf633b13f0855b732f1dc2c706ba60c9291
--- 1/configure.in
--- 2/configure.in
+++ b/configure.in
@@@ -221,10 -217,8 +217,9 @@@ AC_CHECK_HEADERS([ 
    sys/sendfile.h \
    sys/socket.h \
    sys/time.h \
 +  sys/timerfd.h \
    sys/uio.h \
    sys/wait.h \
-   unistd.h \
  ])
  AC_CHECK_HEADERS(sys/sysctl.h, [], [], [
  #ifdef HAVE_SYS_PARAM_H