shim 15.3 release candidate 3

Yet another release candidate.  Here's the shortlog since rc2:

Chris Coulson (2):
      Ensure that MOK variable mirroring creates well formed ESLs
      Avoid creating unnecessary mirrored MOK variables

Gary Lin (1):
      arm and aarch64: include the aligned part in SizeOfRawData of sbat

Javier Martinez Canillas (1):
      shim: Use the default loader if an EFI_LOAD_OPTION can't be parsed

Paul Moore (1):
      build: load local build configuration from Make.local if present

Thomas Frauendorfer | Miray Software (1):
      Sort input file names in lib/Makefile
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