openssl: Build with -fno-strict-aliasing

OpenSSL contains numerous aliasing violations, in places
that are hard to fix without breaking API and ABI.
Disable the optimization locally so we can build other
parts of the tree with strict-aliasing

Change-Id: I38cbc16b31a9831b30c1c3128b5c7f5f17b3aaea
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>