fix: copy Azahar and Flycast files on macOS too

--standalone-copies named Linux and Windows folders for Azahar's aes_keys.txt and boot9.bin and Flycast's dc_boot.bin and dc_nvmem.bin, and nothing for macOS, where both emulators read a fixed folder: ~/Library/Application Support/Azahar/sysdata (common_paths.h:36,61) and ~/Library/Application Support/Flycast/data (osx-main.mm:83-101). A test now requires a macOS folder on every copy.

platforms/_registry.yml

@@ -43,6 +43,9 @@ _standalone_copies: &standalone_copies
       - $HOME/.var/app/org.azahar_emu.Azahar/data/azahar-emu/sysdata
       windows:
       - '%APPDATA%\Azahar\sysdata'
+      # common_paths.h:36,61 (azahar 987f1840).
+      darwin:
+      - $HOME/Library/Application Support/Azahar/sysdata
   - file: Citra/sysdata/boot9.bin
     targets:
       linux:
@@ -50,6 +53,9 @@ _standalone_copies: &standalone_copies
       - $HOME/.var/app/org.azahar_emu.Azahar/data/azahar-emu/sysdata
       windows:
       - '%APPDATA%\Azahar\sysdata'
+      # common_paths.h:36,61 (azahar 987f1840).
+      darwin:
+      - $HOME/Library/Application Support/Azahar/sysdata
   # DuckStation (PS1)
   - pattern: 'scph*.bin'
     targets:
@@ -149,6 +155,9 @@ _standalone_copies: &standalone_copies
       - $HOME/.var/app/org.flycast.Flycast/data/flycast
       windows:
       - '%APPDATA%\flycast\data'
+      # shell/apple/emulator-osx/emulator-osx/osx-main.mm:83-101 (flycast 6bb0fc3e).
+      darwin:
+      - $HOME/Library/Application Support/Flycast/data
   - file: dc/dc_nvmem.bin
     targets:
       linux:
@@ -156,6 +165,9 @@ _standalone_copies: &standalone_copies
       - $HOME/.var/app/org.flycast.Flycast/data/flycast
       windows:
       - '%APPDATA%\flycast\data'
+      # shell/apple/emulator-osx/emulator-osx/osx-main.mm:83-101 (flycast 6bb0fc3e).
+      darwin:
+      - $HOME/Library/Application Support/Flycast/data
 
 platforms:
   retroarch:

tests/test_install.py

@@ -3000,5 +3000,24 @@ class NoFallbackOutsideWhatAPlatformReads(unittest.TestCase):
         self.assertIn("--dest", err.getvalue())
 
 
+class EveryStandaloneCopyNamesItsMacFolder(unittest.TestCase):
+    """--standalone-copies copied Azahar's keys and Flycast's boot ROM on
+    Linux and Windows and silently skipped them on macOS, where both
+    emulators read a fixed Application Support folder."""
+
+    def test_each_copy_has_a_darwin_target(self):
+        import yaml
+
+        registry = yaml.safe_load(
+            (Path(__file__).resolve().parents[1] / "platforms" / "_registry.yml").read_text()
+        )
+        missing = [
+            entry.get("file") or entry.get("pattern")
+            for entry in registry["_standalone_copies"]
+            if entry.get("targets") and "darwin" not in entry["targets"]
+        ]
+        self.assertEqual(missing, [])
+
+
 if __name__ == "__main__":
     unittest.main()