This provides a mechanism for using arbitrarily-named variables within gPXE, using the existing syntax for settings.
Add FILE_LICENCE declarations to almost all files that make up the various standard builds of gPXE.
Add SMBIOS asset tag as a named setting. Signed-off-by: Michael Brown <mcb30@etherboot.org>
EFI provides a copy of the SMBIOS table accessible via the EFI system table, which we should use instead of manually scanning through the F000:0000 segment.