[meson] Use dependency() instead of find_library() for SDL2/GLFW detection.

Since we're not linking to the libraries anymore, it doesn't make much sense to
use find_library, and in fact we need to use dependency() in order to get the
right CFLAGS for includes, defines, etc, so use that instead.

As a result, we can remove the 'SDL2/' folders from the includes, making the SDL
includes more correct.

include/native/wsi/native_sdl2.h

@@ -1,6 +1,6 @@
 #include <windows.h>
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 namespace dxvk::wsi {
 
@@ -22,4 +22,4 @@ namespace dxvk::wsi {
     return reinterpret_cast<HMONITOR>(static_cast<intptr_t>(displayId + 1));
   }
 
-}
+}

meson.build

@@ -127,8 +127,8 @@ else
     './include/native/directx'
   ]
 
-  lib_sdl2 = cpp.find_library('SDL2', required: false)
-  lib_glfw = cpp.find_library('glfw', required: false)
+  lib_sdl2 = dependency('SDL2', required: false)
+  lib_glfw = dependency('glfw', required: false)
   if lib_sdl2.found()
     compiler_args += ['-DDXVK_WSI_SDL2']
   endif

src/wsi/meson.build

@@ -14,6 +14,13 @@ wsi_src = [
 
 wsi_deps = [ dep_displayinfo ]
 
+if platform != 'windows'
+  wsi_deps += [
+    lib_sdl2.partial_dependency(compile_args: true, includes: true),
+    lib_glfw.partial_dependency(compile_args: true, includes: true),
+  ]
+endif
+
 wsi_lib = static_library('wsi', wsi_src,
   dependencies        : wsi_deps,
   include_directories : [ dxvk_include_path ])

src/wsi/sdl2/wsi_platform_sdl2.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 #include "../wsi_platform.h"
 

src/wsi/sdl2/wsi_window_sdl2.cpp

@@ -9,7 +9,7 @@
 #include "../../util/log/log.h"
 
 #include <windows.h>
-#include <SDL2/SDL_vulkan.h>
+#include <SDL_vulkan.h>
 
 namespace dxvk::wsi {