nss: Drop nss-pem patchset
nss: Drop nss-pem patchset

The patch url went 404 and other distros¹ have discarded it as well in
favor of packaging nss-pem²

[1] https://gitweb.gentoo.org/repo/gentoo.git/commit/dev-libs/nss?id=5eca3e02c87163b3c541cdee893830d201abfb86
[2] https://github.com/kdudka/nss-pem

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