Zbigniew Jędrzejewski-Szmek b4a1854397 sd-boot: pad .sbat section to 1k bytes
Fedora's kernels now ship with a .sbat section:
  kernel,1,Red Hat,kernel-core,6.17.0-0.rc1.250814g0cc53520e68b.20.fc44.x86_64,mailto:secalert@redhat.com
  kernel.fedora,1,Red Hat,kernel-core,6.17.0-0.rc1.250814g0cc53520e68b.20.fc44.x86_64,mailto:secalert@redhat.com
This pushes the combined .sbat section just over its pre-allocated size of 512 bytes:
  File "/usr/bin/ukify", line 1048, in pe_add_sections
    raise PEError(f'Not enough space in existing section {section.name} to append new data')
  PEError: Not enough space in existing section .sbat to append new data

PE sections need to align to 512 bytes, so to make it all fit we pad the .sbat
section with zeros to 1k. Various tools already should strip trailing zeros when
using sbat sections, since ukify always inserts a trailing NUL.

The defines are moved to sbat.h, they are used only in sd-stub and sd-boot.
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Systemd

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