RFC: remove zephyr-env.sh

Perez-Gonzalez, Inaky <inaky.perez-gonzalez@...>

Hello All

https://jira.zephyrproject.org/browse/ZEP-211 has been entered to track
a proposal to remove zephyr-env.sh.

<<from the ticket>>
Currently we require the user to source the zephyr-env.sh environment
to set up the build environment. This is awkward; things build fine
without it and the user still has to manually setup ZEPHYR_BASE,
ZEPHYR_GCC_VARIANT and ZEPHYR_SDK_INSTALL_DIR. zephyr-env.sh has grown
to be huge and most of the code seems to be just verifying the
environment where it is running.

Unless there is a pressing need for it, this is a proposal to remove

Does anyone have reasons not to remove it? I'd like to hear.

Thank you!

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