chore: merge round 4 fixes (links)

Both branches extracted RetroBat's Flycast BiosPath: value_folders
already produces the record, so the dedicated extractor is dropped and
its test reads the generic one.

platforms/batocera.yml

@@ -6111,6 +6111,14 @@ launchers:
   fails_when_missing: false
   depends_on_option: gsplus_bios_filename
   source_ref: "package/batocera/core/batocera-configgen/configgen/configgen/generators/gsplus/gsplusGenerator.py:105"
+- emulator: flycast
+  build: standalone
+  kind: passes_path
+  names: []
+  search_dir: /userdata/bios/dc
+  passes_to: environment FLYCAST_BIOS_PATH
+  fails_when_missing: false
+  source_ref: "package/batocera/core/batocera-configgen/configgen/configgen/generators/flycast/flycastGenerator.py:199"
 - emulator: o2em
   build: libretro
   kind: core_option

platforms/emudeck.yml

@@ -66,6 +66,14 @@ standalone_cores:
 - xenia
 - xenianative
 - yuzu
+dual_mode_cores:
+- flycast
+- mame
+- melonds
+- mgba
+- mupen64plus_next
+- ppsspp
+- scummvm
 systems:
   sony-playstation:
     files:

platforms/rocknix.yml

@@ -757,6 +757,15 @@ launchers:
   source_ref: "projects/ROCKNIX/packages/emulators/standalone/armsx2-sa/config/S922X/ARMSX2/inis/PCSX2.ini:21,\
     \ 475, projects/ROCKNIX/packages/emulators/standalone/armsx2-sa/config/inputplumber/ARMSX2/inis/PCSX2.ini:21,\
     \ 473, projects/ROCKNIX/packages/emulators/standalone/armsx2-sa/package.mk:117-118"
+- emulator: flycast
+  build: standalone
+  kind: passes_path
+  names: []
+  search_dir: /storage/roms/dreamcast/data
+  passes_to: "find_user_data_dir() in core/linux-dist/main.cpp returns it"
+  fails_when_missing: false
+  source_ref: "projects/ROCKNIX/packages/emulators/standalone/flycast-sa/patches/000-conf-dir.patch:25,\
+    \ 29"
 - emulator: drastic
   build: standalone
   kind: links