MTCP: bug fix for readmtcp.c.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1966 ba6dc0ae-232f-0410-883f-9ebac64fc565
Added bin/readdmtcp (symlink to mtcp/readmtcp).

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1967 ba6dc0ae-232f-0410-883f-9ebac64fc565