v86d: Make cross compilation working on more architectures
Since commit
709c603dec19 ("v86d: Accept aarch64 as build host") we
support cross compilation on aarch64 host in addition to x86 host.
However building on hosts different than two above will fail.
Make cross compilation support more generic by checking for TARGET_ARCH
in v86d configure script with fallback to `uname -m` when not present in
environment and pass TARGET_ARCH explicitly in do_configure().
Cross build for x86 tested on IBM Power 8 machine with RHEL7. Should
work on aarch64 and rest too.
Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
