glibc needs to be the same version across the Fedora base image, the SDK, and the OS about bottlerocket-sdk

[bcressey]

We omit the build of glibc here from the final SDK, but I expect we'll ultimately need to fix it here.

One thing that might work is to define our own custom Rust targets that are copies of the "unknown" ones; part of the trouble is the "host == target" confusion that happens with the x86_64-unknown-linux-gnu triple.

That could double as a fix to #28 since the major reason why that's "hard" is that we have the same underlying confusion.

[iliana]

We omit the build of glibc here from the final SDK, but I expect we'll ultimately need to fix it here.

We do, but various parts of rustlib depend on the toolchain glibc. I ran across compilation errors when building the OS after bumping glibc here.