[configs/releng] Refactor build.sh: build only dual-iso

* This scripts, now runs only in x86_64.
* build.sh does not require arguments to run (no more build, clean, purge).
* /usr/share split is not done anymore: there are some differences between two arches. (ISO size +60MiB)
* /usr/lib/modules split is not done anymore: this was never enabled officially in aitab.

Tested and works fine. Maybe some small cosmetic changes needed.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

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