[Toybox] Errors While Compling fold and/or defconfig: xgetdelim not found

[Oliver Webb]

When I saw that fold got promoted, I pulled the repo and ran make.  Instead of
compiling cleanly, fold.c gave a error that a 'xgetdelim()' didn't exist.
"grep -R"-ing through the code, it was only mentioned in fold.c.

I tried to fix this originally by trying to implement xgetdelim, but
the problem is probably that some un-commited changes were made to
lib/xwrap.c. which fold.c based itself on.  then when _only_ fold.c got
committed were errors apparent.

I can't get a good fix for this command that looks reasonable, compiles,
and passes it's tests; Best I have done was make something that passed the
first test case.

Rob, If you have some changes you made to xwrap.c. Can you commit them?
"make defconfig toybox" no longer works. And everything about this error makes
me think this was a "Develop and test fold.c under a uncommited version of
xwrap.c with xgetdelim(), then only update fold.c" issue. Especially since
versions of fold before it's promotion don't use xgetdelim and compile ceanly

- Oliver Webb <aquahobbyist at proton.me>