wireguard: selftests: restore support for ccache
When moving to non-system toolchains, we inadvertantly killed the ability to use ccache. So instead, build ccache support into the test harness directly. Signed-off-by:Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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