Double free in i2o_ECPublicKey

PR: 3338
crypto/armcap.c: detect ARMv8 capabilities [in 32-bit build].
sha/asm/sha1-armv4-large.pl: add NEON and ARMv8 code paths.
sha/asm/sha256-armv4.pl: add ARMv8 code path.
Unit/regression test for TLS heartbeats.

Regression test against CVE-2014-0160 (Heartbleed).

More info: http://mike-bland.com/tags/heartbleed.html