The ubuntu-toolchain-r PPA has not pushed updates to their GCC builds
in a while, and allegedly GCC 11.1.0 has bugs that make it antithetical
for us to switch to GCC 11.
Upload our own build of the most recent version of GCC 11 for use on
linux-fresh.
Qt but missing some modules that wouldn't build, such as qtwebengine.
qt: Update Qt 5.15.2 and build scripts
Mostly the same package, but fixes numerous bugs with the previous:
missing xcb and related libraries, rpaths of binaries don't link to
each other, directory names are now usable in yuzu.
lat9nq