Avoid implicit declarations of gethostbyname and connect in the
non-autoconf configure script.  This prevents altering the test result
with compilers which do not support implicit function declarations.

A more elaborate pull request has been submitted upstream:

  <https://github.com/spamhaus/rbldnsd/pull/28>

diff --git a/configure b/configure
index b0cb655797639dac..978f480e391a46a8 100755
--- a/configure
+++ b/configure
@@ -173,6 +173,7 @@ else
 fi
 
 if ac_library_find_v 'connect()' "" "-lsocket -lnsl" <<EOF
+char gethostbyname(void); char connect(void);
 int main() { gethostbyname(); connect(); return 0; }
 EOF
 then :