--installed-cores treated a core with no profile as one that reads no
file, and dropped dc/dc_boot.bin for parallel_dc without a word (issue 87).
Such a core is now named, and the firmware its RetroArch .info declares is
kept. core_names lists every core a platform runs, so a profile with no
file is not reported unknown.
Abdessamad Derraz
0179de844c