- pass `--` before passing input files.
- scripts/maketgz: robustify `rm` invocations.
- prefer `$(pwd)` or `$PWD`.
- tests/cmake/test.sh: dump configs to CI log.
- tests/gen_keys.sh: fix to skip DSA if missing.
- replace openssl with `base` and `*sum` tools.
- tests/ossfuzz/ossfuzz.sh: fix to add a space before `-j`.
Closes#2265
Checker script and wordlist comes from curl.
Also:
- checksrc.pl: sync up with curl.
- unfold an IETF URL.
- update all IETF URLs where missing.
Closes#1959
To reduce differences with curl.
Also:
- add most scripts to the source distro tarball. Some were referenced
by build scripts (e.g. `checksrc`).
Closes#1870
