[core] Fix renderdoc API garbage (#3816)

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3816

src/core/tools/renderdoc.h

@@ -6,8 +6,6 @@
 
 #pragma once
 
-struct RENDERDOC_API_1_7_0;
-
 namespace Tools {
 
 class RenderdocAPI {
@@ -18,7 +16,7 @@ public:
     void ToggleCapture();
 
 private:
-    RENDERDOC_API_1_7_0* rdoc_api{};
+    void* rdoc_api{};
     bool is_capturing{false};
 };