Reject multiple -o options

[Nathan Sidwell]

In fixing GCC PR driver/13577, I discovered both gas and ld silently
allow multiple -o options.  This patch fixes that.

Tested on i686-pc-linux-gnu, and manually for multiple -o usage

ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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