Ports: Update openttd's patches to use git patches

Ports/openttd/patches/0002-Memory.patch

@@ -0,0 +1,36 @@
+From 1e9569da4e5b1855031495ca2455ed6fa186b3df Mon Sep 17 00:00:00 2001
+From: Gunnar Beutner <gbeutner@serenityos.org>
+Date: Sat, 17 Apr 2021 15:40:17 +0200
+Subject: [PATCH 2/6] Memory
+
+FIXME: There is no information available about this patch, fill this in.
+---
+ src/spritecache.cpp | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/spritecache.cpp b/src/spritecache.cpp
+index 6d5ce01..2fda8df 100644
+--- a/src/spritecache.cpp
++++ b/src/spritecache.cpp
+@@ -944,6 +944,7 @@ static void GfxInitSpriteCache()
+ 	/* Remember 'target_size' from the previous allocation attempt, so we do not try to reach the target_size multiple times in case of failure. */
+ 	static uint last_alloc_attempt = 0;
+ 
++#ifndef __serenity__
+ 	if (_spritecache_ptr == nullptr || (_allocated_sprite_cache_size != target_size && target_size != last_alloc_attempt)) {
+ 		delete[] reinterpret_cast<byte *>(_spritecache_ptr);
+ 
+@@ -979,6 +980,10 @@ static void GfxInitSpriteCache()
+ 			ScheduleErrorMessage(msg);
+ 		}
+ 	}
++#else
++    _allocated_sprite_cache_size = target_size / 5;
++    _spritecache_ptr = reinterpret_cast<MemBlock *>(new byte[_allocated_sprite_cache_size]);
++#endif
+ 
+ 	/* A big free block */
+ 	_spritecache_ptr->size = (_allocated_sprite_cache_size - sizeof(MemBlock)) | S_FREE_MASK;
+-- 
+2.36.1
+