Patch ping: multiple -o options

[Nathan Sidwell]

http://sources.redhat.com/ml/binutils/2004-03/msg00137.html

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
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