rust sets LD_LIBRARY_PATH which causes a lot of problems with host
binaries conflicting with SDK libraries. By using sh/bash from the
SDK we avoid those issues.
[YOCTO #14878]
(From OE-Core rev: dabd97e78a599a81c056c0f3291244f5afae44b0)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>