Don't add potentially nasty stderr uses to dead CRYPTO_dbg_mem functions.
But do use the abort(), which we are hoping all future vendors will move
towards the more modern "do not flush streams"; hint hint, if you didn't
do that already, there are grave risks because much software brings risk
without that behaviour. We didn't cause the change.. POSIX did...
ok beck
TLS would not be entirely functional without extensions, so unifdef
OPENSSL_NO_TLSEXT.

ok tedu@
ECDH and ECDSA will not work overly well if there is no EC, so unifdef
OPENSSL_NO_EC.

ok tedu@
unifdef -UDOXYGEN and manually remove the few doxygen comments that are not
wrapped in #ifdef DOXYGEN...

Requested by miod@