And make errors gcc-style, so emacs can jump through the automatically.
```
In devtools/reduce-includes.sh line 21:
echo -n "-$LINE"
^-- SC3037 (warning): In POSIX sh, echo flags are undefined.
In devtools/reduce-includes.sh line 25:
echo -n "."
^-- SC3037 (warning): In POSIX sh, echo flags are undefined.
In tools/rel.sh line 6:
prefix=$(printf '%s\n' "${from#$common}" | sed 's@[^/][^/]*@..@g')
^-----^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.
Did you mean:
prefix=$(printf '%s\n' "${from#"$common"}" | sed 's@[^/][^/]*@..@g')
In tools/rel.sh line 7:
printf '%s\n' "$prefix/${to#$common}"
^-----^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.
Did you mean:
printf '%s\n' "$prefix/${to#"$common"}"
For more information:
https://www.shellcheck.net/wiki/SC3037 -- In POSIX sh, echo flags are undef...
https://www.shellcheck.net/wiki/SC2295 -- Expansions inside ${..} need to b...
make: *** [Makefile:553: check-shellcheck] Error 123
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
