[File] [PATCH] Recognize AMD/Xilinx accelerator files

[Sonal Santan]

Hello,

This patch adds support to recognize "xclbin" binary files used by
AMD/Xilinx accelerators like Alveo--

https://www.xilinx.com/products/boards-and-kits/alveo.html

The xclbin files are defined as part of XRT source tree--

https://github.com/Xilinx/XRT/blob/master/src/runtime_src/core/include/xclbin.h

The patch updates magic/Magdir/xilinx to recognize xclbin files. A test
has been added to the tests directory which includes a 512B snippet of
binary xclbin file. A diff file with changes and the snippet of binary
xclbin file are attached.

I hope this can be applied to a future version of the file utility.

-Sonal
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