Added Database values (#2177)

Added Database values to Contentless Cores, so they can have thumbnail files of the same name.

dist/info/anarch_libretro.info

@@ -14,6 +14,7 @@ systemid = "anarch"
 # Libretro Features
 supports_no_game = "true"
 single_purpose = "true"
+database = "Anarch"
 cheats = "false"
 savestate = "false"
 savestate_features = "null"

dist/info/gong_libretro.info

@@ -16,6 +16,7 @@ manufacturer = "N/A"
 # Libretro Features
 supports_no_game = "true"
 single_purpose = "true"
+database = "Gong"
 savestate = "true"
 savestate_features = "serialized"
 cheats = "false"

dist/info/mcsoftserve_libretro.info

@@ -13,6 +13,9 @@ systemname = "C713"
 systemid = "taylor"
 
 # Libretro Features
+supports_no_game = "true"
+single_purpose = "true"
+database = "McSoftServe"
 cheats = "false"
 core_options = "false"
 hw_render = "false"
@@ -22,5 +25,3 @@ libretro_saves = "false"
 load_subsystem = "false"
 needs_fullpath = "false"
 savestate = "false"
-single_purpose = "true"
-supports_no_game = "true"

dist/info/thepowdertoy_libretro.info

@@ -14,6 +14,7 @@ systemname = "Physics Toy"
 # Libretro Features
 supports_no_game = "true"
 single_purpose = "true"
+database = "The Powder Toy"
 savestate = "true"
 savestate_features = "serialized"
 cheats = "false"