Change to allow signal handlers to set SE and BE bits.

[Corey Minyard]

I have a debugger that runs in an application that requires access to
the SE and BE bits.  The following patch adds that capability to
2.4.21-ben1.  I have tested this, and gdb still seems to correctly step
out of signal handlers, and it seems to work for 4xx.  Does this look ok?

Thanks

-Corey
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