Format all of relibc.
I noticed in an MR that I am working on that there are many formatting errors in the fmt job, so I ran rustfmt on everything to get it all back in compliance since there only seemed to be a few files.
See here for the fmt job output I was looking at: https://gitlab.redox-os.org/wt/relibc/-/jobs/28191
Signed-off-by: Wren Turkal wt@penguintechs.org