Please find the attached binaries, libs, and headers for OpenSSL 0.9.8x built for 'native' Windows RT. The port required some minor edits build scripts but no code changes.
I've gone through all the unit tests included in the OpenSSL package. There was a single failure on both the 'ecsa' and 'ecdh' tests - which both failed with 521bit primes only. All other tests passed with flying colors.
I'm no epileptic curve expert, or OpenSSL expert, so I can't explain the failures but I suspect they are non-critical for the vast majority of applications using OpenSSL.