Retry on permanent DNS error by default

configure

@@ -102,7 +102,7 @@ For better control, use the options below.
   --disable-pps          Disable PPS API support
   --disable-rtc          Don't include RTC even on Linux
   --disable-linuxcaps    Disable Linux capabilities support
-  --enable-forcednsretry Force retry on DNS failure
+  --disable-forcednsretry Don't retry on permanent DNS error
   --with-sendmail=PATH   Path to sendmail binary [/usr/lib/sendmail]
 
 Fine tuning of the installation directories:
@@ -173,7 +173,7 @@ feat_ipv6=1
 feat_pps=1
 try_setsched=0
 try_lockmem=0
-feat_forcednsretry=0
+feat_forcednsretry=1
 mail_program="/usr/lib/sendmail"
 
 for option
@@ -239,8 +239,8 @@ do
     --disable-linuxcaps)
       feat_linuxcaps=0
     ;;
-    --enable-forcednsretry)
-      feat_forcednsretry=1
+    --disable-forcednsretry)
+      feat_forcednsretry=0
     ;;
     --with-sendmail=* )
       mail_program=`echo $option | sed -e 's/^.*=//;'`