Revert "Added prebuilt toolchains"

This reverts commit 9906b8bfd2d3de023a81b100f829969d82659f85.
Revert "Revert "Added prebuilt toolchains""

This reverts commit af716542591c6228d9adc9e7f8ffad5438dd967d.
Revert "Revert "Revert "Added prebuilt toolchains"""

This reverts commit 347c7172c3e59129b49bb06621db11230de2bc2f.