fix(info): remove symlink creation
Remove the creation of the symlink to
a given toolchain from the toolchain_info
rule. The make variable exported was
pointing to the created symlink, rather
than the target given. This is a
unneccessary layer of complexity,
instead this rule will only forward
the toolchain info provider for a given
target which can also be a symlink such
as one created by toolchain_symlink_target
.