fix: keep a buildbot core beside its standalone

installable_cores removed every buildbot name the image builds, so a
libretro core sharing its name with a standalone package was lost:
Batocera runs amiberry standalone and its x86_64 boards fetch
amiberry_libretro. A name now compares within its build mode, and the
resolver and the layouts treat such a core as the emulator's libretro
build, run both ways. Batocera gains amiberry, azahar, cannonball, cemu,
dosbox, ecwolf, eduke32, fsuae, openmsx, rpcs3, supermodel, vita3k, xemu
and ymir as installable, KNULLI cannonball.

scripts/scraper/batocera_scraper.py

@@ -557,19 +557,24 @@ def boards_build(selection: BuildSelection, launchers: list[dict]) -> Callable[[
     return built
 
 
-def installable_cores(selection: BuildSelection, cores: list[str]) -> list[str]:
+def installable_cores(
+    selection: BuildSelection, cores: list[str], standalone: list[str], dual: list[str],
+) -> list[str]:
     """Buildbot cores a board's RetroArch core downloader installs, beyond
-    the cores the image builds.
+    the libretro cores the image builds.
 
     The targets scraper names, per board, the RetroArch targets entry its
     downloader reads (`downloads`): a Batocera x86_64 board installs any
-    core of linux-x86_64, an armv7 one any of linux-armhf.
+    core of linux-x86_64, an armv7 one any of linux-armhf. A name compares
+    within its build mode: amiberry built standalone is another program
+    than amiberry_libretro, which the buildbot serves.
     """
     found: set[str] = set()
     for entry in selection.targets.values():
         if entry.get("downloads"):
             found |= load_target_config("retroarch", entry["downloads"]) or set()
-    return sorted(found - set(cores))
+    built_libretro = (set(cores) - set(standalone)) | set(dual)
+    return sorted(found - built_libretro)
 
 
 def records_run(launchers: list[dict], built: Callable[[str], bool]) -> list[dict]:
@@ -642,7 +647,7 @@ class Scraper(BaseScraper):
         built = boards_build(selection, launchers)
         launchers = records_run(launchers, built)
         cores, standalone, dual = self._fetch_cores(built)
-        installable = installable_cores(selection, cores)
+        installable = installable_cores(selection, cores, standalone, dual)
         libretro_systems = es_systems_libretro_systems(
             self._fetch_text(ES_SYSTEMS_URL.format(tag=self.tag)), _not_cores()
         )

scripts/scraper/knulli_scraper.py

@@ -141,7 +141,7 @@ class Scraper(BaseScraper):
         built = boards_build(selection, launchers)
         launchers = records_run(launchers, built)
         cores, standalone, dual = configgen_cores(defaults, es_systems, dropped, built)
-        installable = installable_cores(selection, cores)
+        installable = installable_cores(selection, cores, standalone, dual)
         # Each system's own list (psx, es_systems.yml:640-653: libretro
         # pcsx_rearmed, swanstation, mednafen_psx, then duckstation and
         # duckstation-legacy).