MTCP: Fix for install target.

/usr/bin/install deferences symlinks when copying files thus we need to
replace install with cp when copying symlinks.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2403 ba6dc0ae-232f-0410-883f-9ebac64fc565
Test: Fix compiler warning.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2404 ba6dc0ae-232f-0410-883f-9ebac64fc565
Increase the runtime of openmp-1 test.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2405 ba6dc0ae-232f-0410-883f-9ebac64fc565