Prefix all build output file names of files which end up in the build
directory with "build/" for consistency (trivial, sort of).
Also, drop printing of "config.g" input file, we usually only print
generated/output files in the build output.
Finally, rename non-existing COMPRESSFLAG variable to
CBFS_PAYLOAD_COMPRESS_FLAG in a printf line. The build output now says
PAYLOAD payload.elf l
for payloads (the "l" specifies LZMA compression).
Signed-off-by: Uwe Hermann <email@example.com>
Acked-by: Uwe Hermann <firstname.lastname@example.org>