applied patch from Allan Clark for UnixWare/OpenServer Daniel

* configure.in nanohttp.c: applied patch from Allan Clark for
  UnixWare/OpenServer
Daniel
diff --git a/configure.in b/configure.in
index 47a27f5..4667901 100644
--- a/configure.in
+++ b/configure.in
@@ -87,7 +87,7 @@
 AC_CHECK_HEADERS(ieeefp.h nan.h math.h fp_class.h float.h)
 AC_CHECK_HEADERS(stdlib.h sys/socket.h netinet/in.h arpa/inet.h)
 AC_CHECK_HEADERS(netdb.h sys/time.h sys/select.h sys/mman.h)
-AC_CHECK_HEADERS(sys/timeb.h signal.h resolv.h)
+AC_CHECK_HEADERS(sys/timeb.h signal.h arpa/nameser.h resolv.h)
 
 dnl Specific dir for HTML output ?
 if test "x$with_html_dir" = "x" ; then