PP/34 Validate tls_require_ciphers on startup, since debugging an invalid
string otherwise requires a connection and a bunch more work and it's
- relatively easy to get wrong.
+ relatively easy to get wrong. Should also expose TLS library linkage
+ problems.
+
+PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
+ 64-bit ${eval} (JH/03).
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