sudo crashes on older kernels

In PostmarketOS we faced the problem that sudo since version 1.9.8 crashes when running on older (<3.17) kernels. This issue has been fixed, see https://github.com/sudo-project/sudo/issues/117.

The maintainer is not going to release a new version anytime soon but there are 2 workarounds to fix this, setting ac_cv_func_getentropy=no before running ./configure or applying the commit to 1.9.8_p2.

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