* [libpsl] Add autoconf-archive to fix libidn2 build
* [libpsl] Speed up build by using ./configure caches
* [libpsl] Prevent cloning gnulib multiple times
Libpsl can either be built with libicu, libidn2, libidn or with
basic internal code. Each built uses different code paths via
conditional compilation. To cover all these paths during fuzzing
and regression testing, new fuzzer targets are added by this commit.