Update libm -> 0.2.1

7 jobs for master in 1 minute and 45 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #23356
build:nightly

00:00:40

passed #23358
build:no_std

00:00:54

passed #23357
build:redox

00:00:43

passed #23355
build:stable

00:00:53

 
  Test
passed #23361
test:benches

00:00:41

passed #23360
test:nightly

00:00:41

passed #23359
test:stable

00:00:50