tree ffcae3b0e2d78152ce696f9ecf4dea30c5db5ca0
parent 06a3735754ddacb3385973daf01b0cb2c17af74b
author Daniel Leung <daniel.leung@intel.com> 1557243466 -0700
committer Anas Nashif <anas.nashif@intel.com> 1561666112 -0400

cmake: use sdk-ng built toolchain for x86_64

This adds the necessary bits to utilize the x86_64 toolchain
built by sdk-ng for x86_64 when toolchain variant is either
zephyr or xtools. This allows decoupling the builds from
the host toolchain.

Newlib is also available with this toolchain so remove
the Kconfig restriction on CONFIG_NEWLIB_LIBC.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>