remove source code support for SDL2

src/modules/system/sdl/System.cpp

@@ -23,20 +23,9 @@
 #include "window/Window.h"
 
 // SDL
-#if __has_include(<SDL3/SDL_clipboard.h>)
 #include <SDL3/SDL_clipboard.h>
 #include <SDL3/SDL_cpuinfo.h>
-#include <SDL3/SDL_version.h>
 #include <SDL3/SDL_locale.h>
-#else
-#include <SDL_clipboard.h>
-#include <SDL_cpuinfo.h>
-#include <SDL_version.h>
-
-#if SDL_VERSION_ATLEAST(2, 0, 14)
-#include <SDL_locale.h>
-#endif
-#endif
 
 namespace love
 {
@@ -52,11 +41,7 @@ System::System()
 
 int System::getProcessorCount() const
 {
-#if SDL_VERSION_ATLEAST(3, 0, 0)
 	return SDL_GetNumLogicalCPUCores();
-#else
-	return SDL_GetCPUCount();
-#endif
 }
 
 bool System::isWindowOpen() const
@@ -106,7 +91,6 @@ std::vector<std::string> System::getPreferredLocales() const
 {
 	std::vector<std::string> result;
 
-#if SDL_VERSION_ATLEAST(3, 0, 0)
 	int count = 0;
 	SDL_Locale **locales = SDL_GetPreferredLocales(&count);
 	for (int i = 0; i < count; i++)
@@ -118,22 +102,6 @@ std::vector<std::string> System::getPreferredLocales() const
 			result.push_back(locale->language);
 	}
 	SDL_free(locales);
-#elif SDL_VERSION_ATLEAST(2, 0, 14)
-	SDL_Locale *locales = SDL_GetPreferredLocales();
-
-	if (locales)
-	{
-		for (SDL_Locale* locale = locales; locale->language != nullptr; locale++)
-		{
-			if (locale->country)
-				result.push_back(std::string(locale->language) + "_" + std::string(locale->country));
-			else
-				result.push_back(locale->language);
-		}
-
-		SDL_free(locales);
-	}
-#endif
 
 	return result;
 }

src/modules/system/sdl/System.h

@@ -26,11 +26,7 @@
 #include "common/EnumMap.h"
 
 // SDL
-#if __has_include(<SDL3/SDL_power.h>)
 #include <SDL3/SDL_power.h>
-#else
-#include <SDL_power.h>
-#endif
 
 namespace love
 {