Enhance CMake configuration for Abseil and SDL2 dependencies

- Added new Abseil components: absl::str_format, absl::container_memory, absl::memory, and absl::utility to the CMake configuration for improved functionality.
- Updated SDL2 configuration to use static targets when bundled and adjusted the handling of system SDL to ensure proper target usage across platforms.

cmake/sdl2.cmake

@@ -1,15 +1,16 @@
 # SDL2
 if (UNIX OR MINGW)
   add_subdirectory(src/lib/SDL)
+  # When using bundled SDL, use the static target
+  set(SDL_TARGETS SDL2-static)
 else()
   find_package(SDL2)
-endif()
-
-set(SDL_TARGETS SDL2::SDL2)
-
-if(WIN32 OR MINGW)
+  # When using system SDL, use the imported targets
+  set(SDL_TARGETS SDL2::SDL2)
+  if(WIN32)
     list(PREPEND SDL_TARGETS SDL2::SDL2main ws2_32)
     add_definitions("-DSDL_MAIN_HANDLED")
+  endif()
 endif()
 
 # libpng and ZLIB dependencies