* configure: Work around ^M handling on cygwin with igncr

--- configure.old	2009-02-23 14:58:37.786900000 +0100
+++ configure	2009-02-23 15:04:28.053300000 +0100
@@ -33980,6 +33980,7 @@ if test "$ac_cs_awk_cr" = "a${ac_cr}b"; 
 else
   ac_cs_awk_cr=$ac_cr
 fi
+ac_cs_awk_cr=$ac_cr
 
 echo 'BEGIN {' >"$tmp/subs1.awk" &&
 _ACEOF