Remove the obsolete WITH clause of CREATE FUNCTION.

This clause was superseded by SQL-standard syntax back in 7.3.
We've kept it around for backwards-compatibility purposes ever since;
but 15 years seems like long enough for that, especially seeing that
there are undocumented weirdnesses in how it interacts with the
SQL-standard syntax for specifying the same options.

Michael Paquier, per an observation by Daniel Gustafsson;
some small cosmetic adjustments to nearby code by me.

Discussion: https://postgr.es/m/20180115022748.GB1724@paquier.xyz

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