VideoBackends / VideoCommon: add support for specifying include files in shader code

Source/Core/VideoBackends/Vulkan/VKGfx.h

@@ -38,8 +38,10 @@ public:
   CreateFramebuffer(AbstractTexture* color_attachment, AbstractTexture* depth_attachment,
                     std::vector<AbstractTexture*> additional_color_attachments) override;
 
-  std::unique_ptr<AbstractShader> CreateShaderFromSource(ShaderStage stage, std::string_view source,
-                                                         std::string_view name) override;
+  std::unique_ptr<AbstractShader>
+  CreateShaderFromSource(ShaderStage stage, std::string_view source,
+                         VideoCommon::ShaderIncluder* shader_includer,
+                         std::string_view name) override;
   std::unique_ptr<AbstractShader> CreateShaderFromBinary(ShaderStage stage, const void* data,
                                                          size_t length,
                                                          std::string_view name) override;