Provide and use a makefile target to build all generated headers.

As of 9.6, pg_regress doesn't build unless storage/lwlocknames.h has been
created; but there was nothing forcing that to happen if you just went into
src/test/regress/ and built there.  We previously had a similar complaint
about plpython.

To fix in a way that won't break next time we invent a generated header,
make src/backend/Makefile expose a phony target for updating all the
include files it builds, and invoke that before building pg_regress or
plpython.  In principle, maybe we ought to invoke that everywhere; but
it would add a lot of usually-useless make cycles, so let's just do it
in the places where people have complained.

I made a couple of cosmetic adjustments in src/backend/Makefile as well,
to deal with the generated headers in consistent orders.

Michael Paquier and Tom Lane

Report: <31398.1467036827@sss.pgh.pa.us>
Report: <20150916200959.GB32090@msg.df7cb.de>

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