Use custom LWIP checksum for ~13% faster checksums #2172
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Use -O2 only on the LWIP checksum routine, resulting in a speedup of around 13% (checksumming only, not entire LWIP stack) for 72 add'l bytes of flash.
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Use -O2 only on the LWIP checksum routine, resulting in a speedup of around 13% (checksumming only, not entire LWIP stack) for 72 add'l bytes of flash.