Test: increase TIMEOUT to 20 seconds with --slow

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2857 ba6dc0ae-232f-0410-883f-9ebac64fc565
Debian: ARM compilation fixes.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2858 ba6dc0ae-232f-0410-883f-9ebac64fc565