erasure-code: conditionally build jerasure sse3/sse4 plugins
autotools: ARM/AArch64 NEON detection similar to x86
aarch64: add support for HW_CAP based neon runtime detection
erasure-code: gf-complete use neon enabled branch

Signed-off-by: Loic Dachary <ldachary@redhat.com>
erasure-code: build and use a NEON jerasure variant
erasure-code: always compile SSE and NEON tests

They do not actually depend on CPU features and are required to validate
the plugin selection logic.

Signed-off-by: Loic Dachary <ldachary@redhat.com>
erasure-code: include new headers in distribution

The NEON optimization introduced new headers that must be listed
explicitly to be included in tarbals.

Signed-off-by: Loic Dachary <ldachary@redhat.com>
erasure-code: test NEON arch selection logic

The jerasure plugin loads the plugin that matches the architecture
supported by the CPU at runtime. Include the NEON plugin in the tests.

Signed-off-by: Loic Dachary <ldachary@redhat.com>
Merge pull request #2694 from dachary/wip-9728-jerasure-neon

erasure-code: jerasure support for NEON

Reviewed-by: Samuel Just <sjust@redhat.com>