[Dev] A patch to speed up extract speed on ARM64

Hi RAR developers:

Here is a patch to improve ARM64 extract speed on ARM64 platform via crc instructions. If the ARM64 support CRC extension, the CRC32 algorism will be optimized as below: b4: 8b020022 add x2, x1, x2 b8: 38401423 ldrb w3, [x1], #1 bc: 1ac34000 crc32b w0, w0, w3 After this change, the extract speed has 10% improvements. Please revew the patch enclosed.

Any feedback would be appreciated.

Chenxi