Get libffi closures to cope with SELinux execmem/execmod

[Andrew Haley]

David Daney writes:

 > Well I'm not Anthony, but I am concerned about the overhead for
 > systems that have an executable stack.  I am thinking small
 > embedded systems.  It would be nice to have some sort of configure
 > option that would allow us to build it the old way, or close to the
 > old way if desired.  That said, I have not measured the size of the
 > dlmalloc and other additions to know if it really makes a
 > difference.  I am trying to put an entire Linux/GNU system with an
 > application statically linked to libgcj into a 16MB flash memory.
 > Adding more code to libgcj does not make it any easier.

Thanks for that.  I agree; it makes no sense to burden non-SELinux
systems with all this stuff.

Andrew.