winpthreads: upgrade libtool to 2.4.2.444.28-053d

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6486 4407c894-4637-0410-b4f5-ada5f102cad1
Fix


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6487 4407c894-4637-0410-b4f5-ada5f102cad1