Apply %cs segment limit workaround for direct_dpmi_switch on
exec-shield kernels. Fixes #1478658: Crash on every DPMI program
under Linux 2.6.16.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1571 7758b857-130e-0410-ab9c-d8735a528d18