in scripts/tls13.test, use fips-compatible server-side cipher suite for "TLS v1.3 cipher suite mismatch" test, and modernize some syntax;
in configure.ac, omit earlydata from enable-all when asynccrypt, pending fix;
also in configure.ac, fix AC_CHECK_DECLS()-overriding-AC_CHECK_FUNCS() kludge, to fix CPPFLAGS=-std=c99 builds.