erasure code arm 32 and 64 bit neon optimisations

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Hi,

gf-complete has since last week optimisations using ARM's NEON SIMD
instruction set. This patch set adds a jerasure erasure code plugin
using the NEON optimisations.

Reed-Solomon-Vandermonde encoding for large block sizes (256k) is 2-8
times faster depending on the number of chunks and erasures (tested on
cortex-a9, coretex-a53 and cortex-a57). For smaller block size (4k) the
speed-up is smaller since the memory management overhead is larger than
encoding workload.

cheers Janne

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