[with spkg; positive review] Fix readline related build problems on OpenSUSE 11.1

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/4843">trac #4843</a>.

There are some small issues with Sage's readline and the one from OpenSUSE not playing well together. I have some temporary fix to get around this.

Cheers,

Michael

Reported by: mabshoff

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