Fix buildroot when launched from install script

[jordancarlin]

Generating buildroot worked when the makefile was launched directly but not when the install script called it. The issue was that $WALLY was not set.

[jordancarlin]

Hmm. Seems like the updated version of buildroot doesn't like being built as root, which happens when running the install script. The problem seems to be specific to building tar.

[davidharrishmc]

Don't love a configuration option called
FORCE_UNSAFE_CONFIGURE

Are there any alternatives?

[jordancarlin]

Not a fan of it either. It's what the error message mentioned, so I'm testing it as a starting point to see if it actually fixes the problem. Will see how it goes in the CI and then investigate other options. There was nothing immediately apparent though.

[jordancarlin]

Seems like with the new version of OpenSBI we need 1600000 instructions get to the OpenSBI banner instead of the previous 1400000. Updated regression-wally accordingly.

[jordancarlin]

Looks like this did work to successfully install buildroot on all distros. I don't love needing to pass that configuration flag, but unfortunately I can't really think of a better option.