- Add -C flag to ./configure for caching results
- Use --depth 1 for git clone (faster)
- Use make -j$(nproc) for stabber/libstrophe builds
Borrowed optimizations from build/multicore branch.
- Add TERM=xterm-256color for PTY support in functional tests
- Disable SSL verification for git clone in restricted networks
- Add error handling for Arch reflector installation
* Also pass `$*` to `configure` when invoking `ci-build.sh`, so one can
e.g. run `./ci-build.sh --without-xscreensaver`
Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>