changes for expect to build on IRIX 6

[Alexandre Oliva]

I needed these changes in order for the copy of expect in srcware to
build on IRIX 6.  Some of the changes were needed by GCC, some by the
native cc.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer