* performance(sqlcipher): provide optimized versions of sha1_compress
- on ARM, use Neon/ACLE extensions (a 3x-4x perf improvement)
- on x64 use a plain C implementation from nayuki (a 2x-3x perf gain)
Unfortunately, we can't use the dedicated `SHA1` extension on x64 as this
became widely available only recently (esp. on AMD CPUs)