Use CPPFLAGS supplied by the environment during the build
Remove references to __DATE__ to make the build reproducible
Allow selecting only SINIT modules that match platform
Introduce GRUB_TBOOT_SINIT_LIST for selecting SINIT modules to use
Ignore modules that overlap with internal data structures
txt-acminfo: Map TXT heap using mmap
Support higher resolution monitors
Remove poly1305 object files on clean