games/warzone2100: fix upstream patch handling

Instead of using PATCHFILES, handle backported upstream commit as
a patch under files/, where it is always available, manageable and
where it doesn't break when patch format changes.

Pointyhat to:   jbeich

games/warzone2100/Makefile

@@ -6,9 +6,6 @@ MASTER_SITES=	SF/${PORTNAME}/releases/${PORTVERSION}/
 DISTNAME=	${PORTNAME}_src
 DIST_SUBDIR=	${PORTNAME}-${PORTVERSION}
 
-PATCH_SITES=	https://github.com/${PORTNAME}/${PORTNAME}/commit/
-PATCHFILES+=	5e6fdab3feac.patch:-p1 # https://github.com/Warzone2100/warzone2100/pull/2479
-
 MAINTAINER=	amdmi3@FreeBSD.org
 COMMENT=	Innovative 3D real-time strategy game
 

games/warzone2100/distinfo

@@ -1,5 +1,3 @@
 TIMESTAMP = 1618939913
 SHA256 (warzone2100-4.0.1/warzone2100_src.tar.xz) = 337622d5f813bbc1f9a3b4fee0874fcc074806781cfa9c25a252534ddd240ab9
 SIZE (warzone2100-4.0.1/warzone2100_src.tar.xz) = 337713608
-SHA256 (warzone2100-4.0.1/5e6fdab3feac.patch) = 579ffd85c09ffca615a9c90cb07d1021d7dc58fe12dffed8c7e5602cdaa8ca7d
-SIZE (warzone2100-4.0.1/5e6fdab3feac.patch) = 1737

games/warzone2100/files/patch-5e6fdab

@@ -0,0 +1,49 @@
+From 5e6fdab3feac55357bcaedcb03ef619d23d3277f Mon Sep 17 00:00:00 2001
+From: past-due <30942300+past-due@users.noreply.github.com>
+Date: Sat, 4 Dec 2021 11:22:24 -0500
+Subject: [PATCH] [Vulkan] Add missing vk:: namespace to `throwResultException`
+
+---
+ lib/ivis_opengl/gfx_api_vk.cpp | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/lib/ivis_opengl/gfx_api_vk.cpp b/lib/ivis_opengl/gfx_api_vk.cpp
+index 594d127f70..419b8a7644 100644
+--- lib/ivis_opengl/gfx_api_vk.cpp
++++ lib/ivis_opengl/gfx_api_vk.cpp
+@@ -477,7 +477,7 @@ void BlockBufferAllocator::allocateNewBlock(uint32_t minimumSize)
+ 	if (result != vk::Result::eSuccess)
+ 	{
+ 		// Failed to allocate memory!
+-		throwResultException( result, "vmaCreateBuffer" );
++		vk::throwResultException( result, "vmaCreateBuffer" );
+ 	}
+
+ 	if (autoMap)
+@@ -1304,7 +1304,7 @@ VkPSO::VkPSO(vk::Device _dev,
+ 			object = std::move(result.value);
+ 			break;
+ 		default:
+-			throwResultException(result.result, "createGraphicsPipeline");
++			vk::throwResultException(result.result, "createGraphicsPipeline");
+ 	}
+ }
+
+@@ -1368,7 +1368,7 @@ void VkBuf::allocateBufferObject(const std::size_t& size)
+ 	if (result != vk::Result::eSuccess)
+ 	{
+ 		// Failed to allocate memory!
+-		throwResultException( result, "vmaCreateBuffer" );
++		vk::throwResultException( result, "vmaCreateBuffer" );
+ 	}
+
+ 	buffer_size = size;
+@@ -1486,7 +1486,7 @@ VkTexture::VkTexture(const VkRoot& root, const std::size_t& mipmap_count, const
+ 	if (result != vk::Result::eSuccess)
+ 	{
+ 		// Failed to allocate memory!
+-		throwResultException( result, "vmaCreateImage" );
++		vk::throwResultException( result, "vmaCreateImage" );
+ 	}
+
+ 	const auto imageViewCreateInfo = vk::ImageViewCreateInfo()