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This adds devel/xtensa-esp32-elf which builds the Espressif

Description

This adds devel/xtensa-esp32-elf which builds the Espressif
ESP32 toolchain for use with Arduino and FreeRTOS projects.

Reviewed by: matthew (mentor)
Approved by: matthew (mentor)
Differential Revision: https://reviews.freebsd.org/D15271