Fix building a toolchain installer with bitbake
-c populate_sdk in packages compiler-rt,
compiler-rt-dev and compiler-rt-staticdev.
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
(cherry picked from commit fcbebdf58f)
Redid how compiler-rt is built by using the Rust makefiles to build it
instead of compiler-rt's build system. Rust itself deviated from using
compiler-rt's build system and provided their own rules requiring the
source tree to be configured to use them.