gnu: unknown-horizons: Fix build and runtime errors.

Apply two upstream commits that allow building with Python 3.9 or newer and
running with Python 3.10.

* gnu/packages/patches/unknown-horizons-python-3.9.patch: New file.
* gnu/packages/patches/unknown-horizons-python-3.10.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/games.scm (unknown-horizons)[source]: Apply them.

Change-Id: Icbc8b698b913be01465b09ab26afb29e5fd62a87
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
Fixes: Unknown Horizons fails to start <https://bugs.gnu.org/54815>

2 files changed, 73 insertions, 0 deletions

diff --git a/gnu/packages/patches/unknown-horizons-python-3.10.patch b/gnu/packages/patches/unknown-horizons-python-3.10.patch
new file mode 100644
index 0000000000..599de1fec5
--- /dev/null
+++ b/gnu/packages/patches/unknown-horizons-python-3.10.patch
@@ -0,0 +1,32 @@
+From 4ff605d6c55fcf3e9b4777ffbcb0c24ef17ba4ca Mon Sep 17 00:00:00 2001
+From: Arti <artism90@googlemail.com>
+Date: Mon, 28 Feb 2022 21:19:50 +0100
+Subject: [PATCH] Rename instances of `collections.Iterable` into
+ `collections.abc.Iterable` (#2956)
+
+---
+ horizons/ai/aiplayer/combat/unitmanager.py | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/horizons/ai/aiplayer/combat/unitmanager.py b/horizons/ai/aiplayer/combat/unitmanager.py
+index 8449d5563c5..57db0d47061 100644
+--- a/horizons/ai/aiplayer/combat/unitmanager.py
++++ b/horizons/ai/aiplayer/combat/unitmanager.py
+@@ -151,7 +151,7 @@ def _ship_state_rule(self, state_dict, ship_states):
+ 		"""
+ 		Rule stating that ship has to be in any of given states.
+ 		"""
+-		if not isinstance(ship_states, collections.Iterable):
++		if not isinstance(ship_states, collections.abc.Iterable):
+ 			ship_states = (ship_states,)
+ 		return lambda ship: (state_dict[ship] in ship_states)
+ 
+@@ -178,7 +178,7 @@ def filter_ships(self, ships, rules):
+ 		@param rules: conditions each ship has to meet (AND)
+ 		@type rules: iterable of lambda(ship) or single lambda(ship)
+ 		"""
+-		if not isinstance(rules, collections.Iterable):
++		if not isinstance(rules, collections.abc.Iterable):
+ 			rules = (rules,)
+ 		return [ship for ship in ships if all((rule(ship) for rule in rules))]
+ 
diff --git a/gnu/packages/patches/unknown-horizons-python-3.9.patch b/gnu/packages/patches/unknown-horizons-python-3.9.patch
new file mode 100644
index 0000000000..8b93a71b6c
--- /dev/null
+++ b/gnu/packages/patches/unknown-horizons-python-3.9.patch
@@ -0,0 +1,41 @@
+From 7f6f613826aef9810999c1599c8354e8a78fbdb4 Mon Sep 17 00:00:00 2001
+From: Lukas1818 <44570204+Lukas1818@users.noreply.github.com>
+Date: Fri, 19 Feb 2021 21:08:44 +0100
+Subject: [PATCH] fixs for Phyton 3.9 (#2955)
+
+* change deprecated isAlive() to is_alive()
+
+* remove unsupported keyword "encoding"
+
+Co-authored-by: Lukas1818 <git@lukas1818.de>
+---
+ horizons/util/loaders/jsondecoder.py | 2 +-
+ horizons/util/preloader.py           | 4 ++--
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/horizons/util/loaders/jsondecoder.py b/horizons/util/loaders/jsondecoder.py
+index ea2ddfb3308..138a948f42a 100644
+--- a/horizons/util/loaders/jsondecoder.py
++++ b/horizons/util/loaders/jsondecoder.py
+@@ -37,4 +37,4 @@ def _decode_dict(dct):
+ 			return newdict
+ 
+ 		with open(path, "r") as f:
+-			return json.load(f, encoding="ascii", object_hook=_decode_dict)
++			return json.load(f, object_hook=_decode_dict)
+diff --git a/horizons/util/preloader.py b/horizons/util/preloader.py
+index 5689cc68152..2e072fcc642 100644
+--- a/horizons/util/preloader.py
++++ b/horizons/util/preloader.py
+@@ -79,9 +79,9 @@ def wait_for_finish(self):
+ 		"""
+ 		self.lock.acquire()
+ 		# wait until it finished its current action
+-		if self.isAlive():
++		if self.is_alive():
+ 			self.join()
+-			assert not self.isAlive()
++			assert not self.is_alive()
+ 		else:
+ 			try:
+ 				self.lock.release()