bootsplash.jpg was also missing for me. After the script failure, I removed the coreboot-files directory and cloned https://source.puri.sm/coreboot/coreboot-files instead.
cd coreboot
rm -rf coreboot-files/
git clone https://source.puri.sm/coreboot/coreboot-files.git
It gets all the expected files (including the purism logo for the bootsplash). However, the build fails at the LIBELF step, here’s what I believe to be the relevant section of coreboot/util/crossgcc/build-LIBELF/build.log.
In file included from ../../elfutils-0.170/backends/m68k_corenote.c:72:
../../elfutils-0.170/backends/linux-core-note.c:116:1: error: alignment 2 of 'struct m68k_prstatus' is less than 4 [-Werror=packed-not-aligned]
;
^
../../elfutils-0.170/backends/linux-core-note.c:110:5: error: '({anonymous})' offset 70 in 'struct m68k_prstatus' isn't aligned to 4 [-Werror=packed-not-aligned]
;
^
cc1: all warnings being treated as errors
Full trace on 0-bin: https://0bin.net/paste/jJeONvLKYkJD-2B-#2bMUQ1IjG7mNQYTc4NiWrvjS4NF0uJFTYqf1nytKBjc