- This makes linking easier,
- Adds the right includes (needed on FreeBSD),
- Lets us drop silly GUI setting for non-GUI tests (I think this was
a side-effect of compiling on FreeBSD, where UI would pull in
/usr/local/include).
- Let's just have one header definining export- and visibility-
macros for Calamares. They are still selected based on the
export flags (*_PRO), just defined in one header instead of two.
- Physical memory can't be negative, so it is reported as
an unsigned long, but the bytes-to-MiB functions do accept
negative amounts. As long as no machine has more than 2**62
bytes of memory, we're good though.
