shuf; Drop inline after switched to fxhash

[oech3]

fxhash might changed nstructions,cycles,L1-icache-load-misses,branches,branch-misses

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/tail/symlink is no longer failing!

[sylvestre]

fxhash might changed nstructions,cycles,L1-icache-load-misses,branches,branch-misses

sorry, i don't understand this message and how it is related with inline

[oech3]

inline(never) was added to avoid performance regression with codegen-units=1 (improve cache hit and branch-misses).
Also switching to fxhash also improved them. So I considered that we achieved enough cache to inline shuf_exec again for perf.

But it seems useful only for cleaning code currently https://codspeed.io/uutils/coreutils/branches/oech3%3Ashuf-inline?utm_source=github&utm_medium=check&utm_content=button&q=shuf