postgresql: split dev output

This splits a dev output to make the default output not depend on any
build dependencies anymore. This also avoids removing references from
pgxs' Makefile this way, which should, at least theoretically, be good
to build extensions via pgxs, making sure they use the same tooling.

ecpg is the "embedded SQL C preprocessor", which is certainly a dev
tool.

Most important, for closure size anyway, is to move pg_config to the dev
output, since it retains paths to all the other outputs.

The only thing with references to the dev output remaining is then the
postgres binary itself. It contains all the output paths, because it
shows those in the pg_config system view. There is no other way than
to nuke those references to avoid circular dependencies between outputs
- and blowing up closure size again.

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