[patch/rfc] delete IRIX 4 (and IRIX 3) support

[Andrew Cagney]

Hello,

This patch removes IRIX 4 (and earlier) support from GDB.  Turns out 
that the configuration was forcing CC into K&R mode and hence IRIX 4 
couldn't have built since GDB 5.0.

Rather than leaving IRIX 3 dangling, it deletes that too.

I'll look to commit this in a week,
Andrew
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