sdl2-doom: add package

Add simple port to SDL2 of the classic DOOM engine.
Works fine on Wayland without requiring any 3D hardware acceleration.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

games/sdl2-doom/Makefile

@@ -0,0 +1,44 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=sdl2-doom
+PKG_SOURCE_DATE:=2022-03-06
+PKG_RELEASE:=1
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/AlexOberhofer/sdl2-doom
+PKG_SOURCE_VERSION:=da7732ee6318371db2ee04ec4702c6064245846b
+PKG_MIRROR_HASH:=871f9892ac49766e2729ae5c6ce1f75f830361aea048f2e8a64c3db63de7e121
+
+PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
+PKG_LICENSE:=GPL-2.0-or-later
+PKG_LICENSE_FILES:=License.md
+
+PKG_BUILD_FLAGS:=gc-sections lto
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Package/sdl2-doom
+  SECTION:=games
+  CATEGORY:=Games
+  TITLE:=SDL2 Doom
+  URL:=https://github.com/AlexOberhofer/sdl2-doom
+  DEPENDS:=+libstdcpp +libsdl2 +libsdl2-mixer
+endef
+
+define Package/sdl2-doom/description
+  This is a source port of the ID Software source release of DOOM.
+  Using low-resolution software rendering designed in 1993 by idSoftware
+  for (from today's perspective) very slow CPUs it runs with good
+  performance even on low-end devices.
+endef
+
+define Package/sdl2-doom/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/sdl2-doom $(1)/usr/bin
+endef
+
+define Build/Install
+endef
+
+$(eval $(call BuildPackage,sdl2-doom))