tests: Rewrite Makefiles for pthreads test

The Makefiles for the pthreads test don't behave like typical
Makefiles that support cross compilation. Rewrite the Makefile to make
cross-compilation more convenient and add targets for aarch{32,64}.

Change-Id: I7cae378492681744b6bb11dd5af69db81ec54229
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/16022
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

tests: add some pthread and std::thread unit tests

This patch adds some pthread and C++11 std::thread unit tests.

Change-Id: I9706b542e5fa927a87c6e8ae2a6330fab7bb5d72
Reviewed-on: https://gem5-review.googlesource.com/8221
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>