Build fails on s390x:

[jmarrero]

Build fails on s390x:

error[E0425]: cannot find value `EFIPN` in this scope
   --> /builddir/build/BUILD/rpm-ostree-2023.5.38.g0cbcf4ae/vendor/bootc-lib/src/install/baseline.rs:247:13
    |
247 |             EFIPN,
    |             ^^^^^ not found in this scope
error[E0425]: cannot find value `EFIPN_SIZE_MB` in this scope
   --> /builddir/build/BUILD/rpm-ostree-2023.5.38.g0cbcf4ae/vendor/bootc-lib/src/install/baseline.rs:248:26
    |
34  | pub(crate) const BOOTPN_SIZE_MB: u32 = 510;
    | ------------------------------------------- similarly named constant `BOOTPN_SIZE_MB` defined here
...
248 |             format!("0:+{EFIPN_SIZE_MB}M"),
    |                          ^^^^^^^^^^^^^ help: a constant with a similar name exists: `BOOTPN_SIZE_MB`
error[E0425]: cannot find value `EFIPN` in this scope
   --> /builddir/build/BUILD/rpm-ostree-2023.5.38.g0cbcf4ae/vendor/bootc-lib/src/install/baseline.rs:252:32
    |
252 |         Some(format!("{device}{EFIPN}"))
    |                                ^^^^^ not found in this scope
For more information about this error, try `rustc --explain E0425`.
error: could not compile `bootc-lib` due to 3 previous errors
Caused by:
  process didn't exit successfully: `rustc --crate-name bootc_lib --edition=2021 /builddir/build/BUILD/rpm-ostree-2023.5.38.g0cbcf4ae/

This blocks an rpm-ostree release as we are vendoring bootc in rpm-ostree.