feat: add knulli target scraper

KNULLI builds per board on Batocera's Kconfig model from its own tree (knulli-cfw/knulli-linux at the tag platforms/knulli.yml pins): configs/knulli-*.board, package/system/knulli-system/Config.in, knulli-es-system/es_systems.yml and the knulli-cfw/buildroot submodule. Ten boards, the armhf library builds excluded.

scripts/scraper/targets/knulli_targets_scraper.py

@@ -0,0 +1,42 @@
+"""Scraper for KNULLI per-board emulator availability.
+
+KNULLI is a Buildroot external tree on Batocera's model, read with the
+Batocera scraper's Kconfig resolution. Sources (knulli-cfw/knulli-linux, at
+the tag platforms/knulli.yml names):
+  - configs/knulli-*.board -- board definitions, each sets
+    BR2_PACKAGE_BATOCERA_TARGET_* and includes knulli-board.common
+  - package/system/knulli-system/Config.in -- the system config, sourced by
+    the root Config.in in place of Batocera's batocera-system/Config.in
+  - package/emulationstation/knulli-es-system/es_systems.yml
+    -- emulator requireAnyOf flag mapping
+Sources (knulli-cfw/buildroot, at the submodule commit the tag pins):
+  - arch/Config.in, package/mesa3d/Config.in, package/libglvnd/Config.in
+
+The *_armhf_libs boards include knulli-board.libs, which builds 32-bit
+libraries for the matching image and turns no system on: they are no target.
+"""
+
+from __future__ import annotations
+
+from .batocera_targets_scraper import Scraper as BatoceraScraper
+from .batocera_targets_scraper import main as batocera_main
+
+PLATFORM_NAME = "knulli"
+
+
+class Scraper(BatoceraScraper):
+    PLATFORM = PLATFORM_NAME
+    REPO = "knulli-cfw/knulli-linux"
+    BOARD_PREFIX = "knulli-"
+    CONFIG_IN_PATH = "package/system/knulli-system/Config.in"
+    ES_SYSTEMS_PATH = "package/emulationstation/knulli-es-system/es_systems.yml"
+    SYSTEM_SYMBOL = "BR2_PACKAGE_KNULLI_SYSTEM"
+    BUILDROOT_REPO = "knulli-cfw/buildroot"
+
+
+def main() -> None:
+    batocera_main(Scraper)
+
+
+if __name__ == "__main__":
+    main()