build: don't link with libnfnetlink

Don't link suricata with libnfnetlink when we don't have support
for NFQUEUE or NFLOG. Previously, suricata was linked with this
library without reason.

configure.ac

@@ -657,6 +657,14 @@
 
     AS_IF([test "x$enable_unixsocket" = "xyes"], [AC_DEFINE([BUILD_UNIX_SOCKET], [1], [Unix socket support enabled])])
 
+    AC_ARG_ENABLE(nflog,
+            AS_HELP_STRING([--enable-nflog],[Enable libnetfilter_log support]),
+                           [ enable_nflog="yes"],
+                           [ enable_nflog="no"])
+    AC_ARG_ENABLE(nfqueue,
+           AS_HELP_STRING([--enable-nfqueue], [Enable NFQUEUE support for inline IDP]),[enable_nfqueue=yes],[enable_nfqueue=no])
+
+    if test "x$enable_nflog" = "xyes" || test  "x$enable_nfqueue" = "xyes"; then
   # libnfnetlink
         case $host in
         *-*-mingw32*)
@@ -691,10 +699,9 @@
             fi
             ;;
         esac
+    fi
 
     #enable support for NFQUEUE
-    AC_ARG_ENABLE(nfqueue,
-           AS_HELP_STRING([--enable-nfqueue], [Enable NFQUEUE support for inline IDP]),,[enable_nfqueue=no])
     AS_IF([test "x$enable_nfqueue" = "xyes"], [
         CFLAGS="$CFLAGS -DNFQ"
 
@@ -781,10 +788,6 @@
   ])
 
   # libnetfilter_log
-    AC_ARG_ENABLE(nflog,
-            AS_HELP_STRING([--enable-nflog],[Enable libnetfilter_log support]),
-                           [ enable_nflog="yes"],
-                           [ enable_nflog="no"])
     AC_ARG_WITH(libnetfilter_log_includes,
             [  --with-libnetfilter_log-includes=DIR  libnetfilter_log include directory],
             [with_libnetfilter_log_includes="$withval"],[with_libnetfilter_log_includes="no"])