bind mount /etc/ld.so.cache to the sandbox

without /etc/ld.so.cache available in the sandbox, tests fail on gentoo with: /usr/bin/ffmpeg: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

build-fail.log build-fixed.log

see https://gitlab.gnome.org/GNOME/gnome-desktop/commit/f4dcb2f2a9f0593ca8f8da6acfe553eaf7600aea for a more in depth explanation.

merged

Merged in a71488d4, thanks :)

Maybe I should add gentoo to the CI to prevent this kind of regressions.

mentioned in issue #93 (closed)

mentioned in commit poncho/torbrowser-overlay@79e71802