Analysis of remaining EGCS references

[Phil Edwards]

> ./libstdc++-v3/docs/17_intro/BADNAMES:For egcs:
> 
> The list as well as the EGCS reference may need updating, if it does
> really relate to EGCS.

Since we're messing with v3 docs anyhow today, I'll fix all of these except
that one.  I don't know how much those "really relate to EGCS."

Phil

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