removing src/{expect,dejagnu}

[Ben Elliston]

For the second year in a row, about 30 people discussed removing the
replicated copies of the DejaGnu and Expect sources from the src
repository at the GCC Summit testing BOF.

The version of Expect in the tree is now 9 years old.  The version of
DejaGnu in the tree is now two releases behind.  Modern systems
provide up-to-date versions of these packages and are easy to install.

Unless there are any violent objections, I intend to remove these
directories in a couple of days' time.

Cheers, Ben

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