games/warzone2100: fix build

Fix build by linking with dynamic SDL2 library instead of the static
one, which pulls transitive dependencies in a broken way.

Reported by:	pkg-fallout, fluffy

games/warzone2100/files/patch-lib_sdl_CMakeLists.txt

@@ -0,0 +1,17 @@
+--- lib/sdl/CMakeLists.txt.orig	2022-11-03 17:44:55 UTC
++++ lib/sdl/CMakeLists.txt
+@@ -49,14 +49,6 @@ if(NOT DEFINED WZ_FINDSDL2_NOCONFIG OR NOT WZ_FINDSDL2
+ 	find_package(SDL2 ${SDL2_MIN_VERSION} CONFIG QUIET)
+ endif()
+ if(SDL2_FOUND)
+-	if (TARGET SDL2::SDL2-static)
+-		# Check for INTERFACE_INCLUDE_DIRECTORIES to ignore the "aliased" target that vcpkg creates
+-		get_target_property(_sdl2_include_dir SDL2::SDL2-static INTERFACE_INCLUDE_DIRECTORIES)
+-		test_link_to_sdl_target(SDL2::SDL2-static LINK_SUCCESS_SDL2_SDL2STATIC_TARGET)
+-		if (_sdl2_include_dir AND LINK_SUCCESS_SDL2_SDL2STATIC_TARGET)
+-			set(_sdl2_library SDL2::SDL2-static)
+-		endif()
+-	endif()
+ 	if (NOT _sdl2_library AND TARGET SDL2::SDL2)
+ 		# Check for INTERFACE_INCLUDE_DIRECTORIES to ignore the "aliased" target that vcpkg creates
+ 		get_target_property(_sdl2_include_dir SDL2::SDL2 INTERFACE_INCLUDE_DIRECTORIES)