Document failure to build the uClibc cross-ldd under Cygwin as a known issue.

/trunk/docs/known-issues.txt | 16 15 1 0 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

 reporter_name="Nye Liu"

 reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00046.html"

 reporter_comment=""