Core: Remove GetHTTPUserAgent()

Only keep the HTTPCache replacement.

src/core/core.cpp

@@ -6,8 +6,6 @@
 #include "settings.h"
 #include "system.h"
 
-#include "scmversion/scmversion.h"
-
 #include "util/ini_settings_interface.h"
 #include "util/input_manager.h"
 
@@ -544,8 +542,3 @@ void Core::SetInputSettingsLayer(SettingsInterface* sif, std::unique_lock<std::m
 {
   s_locals.layered_settings_interface.SetLayer(LayeredSettingsInterface::LAYER_INPUT, sif);
 }
-
-std::string Core::GetHTTPUserAgent()
-{
-  return fmt::format("DuckStation for {} ({}) {}", TARGET_OS_STR, CPU_ARCH_STR, g_scm_tag_str);
-}

src/core/core.h

@@ -64,7 +64,4 @@ SettingsInterface* GetGameSettingsLayer();
 /// Retrieves the input settings layer, if present. Must call with lock held.
 SettingsInterface* GetInputSettingsLayer();
 
-/// Returns the user agent to use for HTTP requests.
-std::string GetHTTPUserAgent();
-
 } // namespace Core