emboss: fix issue with X11

- Add an option to build without-x
- Add a `depends_on :x11` otherwise
- Add a `depends_on :libpng` that was missing.
- Add a `depends_on 'gd'` that is optional.
- Add a `depends_on 'libharu'` also optional for pdf output.
- Add a flag to enable 64bit pointers on 32bit machines.
- Add a flag to enable pthreads.

It's worth noting that this will build against mysql or postgresql.
It searches for `pg_config`. It's reasonable for molecular biology
grinding software have some sort of DB enabled. In that case,
we might want to add an `ENV :userpaths` to pick up the preferred
`pg_config` or we want to add a depends_on postgresql. Thoughts?

Fixes #15782

Closes #15817.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

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