cygport: patch for proper debuginfo

[Marco Atzeri <marco.atzeri@gmail.com>]

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In some conditions the debuginfo creation enters in a never ending loop
due to the asymmetrical usage of readlink between


lib/src_postinst.cygpart :

      origdlname=${dlname}
      while [ $(readlink -f ${ltlibdir}/${dlname%/bin/*}) != 
${D}$(__host_prefix) ]
       do
               dlname=../${dlname}
       done


and bin/cygport.in:
                _topdir=.;


This happens when the directory of building has a link in one
of the parent directories

$ pwd
/pub/devel/openblas

$ readlink -f .
/cygdrive/d/cyg_pub/devel/openblas

Regards
Marco

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diff --git a/bin/cygport.in b/bin/cygport.in
index 1fe804d..2eeff26 100755
--- a/bin/cygport.in
+++ b/bin/cygport.in
@@ -397,7 +397,7 @@ if [ "x${_topdir}" = "x${argv[1]}" ]
 then
 	if [ -f ./${cygportfile} ]
 	then
-		_topdir=.;
+		_topdir=$(readlink -f .);
 	else
 		_topdir=/usr/src;
 	fi