Update CMakeLists.txt to suggested syntax for SDL projects.

Author: nbriggs

CMakeLists.txt

@@ -87,11 +87,11 @@ IF(MAIKO_DISPLAY_X11)
 ENDIF()
 
 IF(MAIKO_DISPLAY_SDL STREQUAL "2")
-  FIND_PACKAGE(SDL2 REQUIRED)
+  FIND_PACKAGE(SDL2 REQUIRED CONFIG REQUIRED COMPONENTS SDL2)
   SET(MAIKO_DISPLAY_SDL_DEFINITIONS
           "-DSDL=2"
           )
-  SET(MAIKO_DISPLAY_SDL_INCLUDE_DIRS "${SDL2_INCLUDE_DIRS}")
+  SET(MAIKO_DISPLAY_SDL_INCLUDE_DIRS SDL2::Headers)
   SET(MAIKO_DISPLAY_SDL_LIBRARIES SDL2::SDL2)
   SET(MAIKO_DISPLAY_SDL_SRCS
           src/sdl.c
@@ -101,11 +101,11 @@ IF(MAIKO_DISPLAY_SDL STREQUAL "2")
           )
   MESSAGE("-- Configured for SDL2 display")
 ELSEIF(MAIKO_DISPLAY_SDL STREQUAL "3")
-  FIND_PACKAGE(SDL3 REQUIRED)
+  FIND_PACKAGE(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3)
   SET(MAIKO_DISPLAY_SDL_DEFINITIONS
           "-DSDL=3"
           )
-  SET(MAIKO_DISPLAY_SDL_INCLUDE_DIRS "${SDL3_INCLUDE_DIRS}")
+  SET(MAIKO_DISPLAY_SDL_INCLUDE_DIRS SDL3::Headers)
   SET(MAIKO_DISPLAY_SDL_LIBRARIES SDL3::SDL3)
   SET(MAIKO_DISPLAY_SDL_SRCS
           src/sdl.c