Deprecate old codecs, ARMv6 discussion

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Hello! Is it possible to bring ARMv6 support back by removing old codecs (CELT, Speex) and upgrading Opus to 1.1.2? Notes from changelog 1.1.1 ARM Neon optimizations contributed by Linaro and ARM, 1.1 speed improvements on all architectures, especially ARM, where decoding uses around 40% less... Deprecate old codecs, ARMv6 discussion