Revert "interface API: add backup memory import/export functions (#930)"

This reverts commit 47f91c4.

this commit breaks build and is reverted until a PR with a fix comes in.

Author: rofl0r

desmume/src/frontend/interface/interface.cpp

@@ -287,28 +287,6 @@ EXPORTED char* desmume_savestate_slot_date(int index)
     return savestates[index].date;
 }
 
-EXPORTED BOOL desmume_backup_import_file(const char *filename, unsigned int force_size) {
-	if (!nds.backupDevice.isBackupDeviceAvailable()) {
-		return FALSE;
-	}
-	
-	bool success = nds.backupDevice.importData(filename, force_size);
-	
-	if (success) {
-		NDS_Reset();
-	}
-	
-	return success ? TRUE : FALSE;
-}
-
-EXPORTED BOOL desmume_backup_export_file(const char *filename) {
-	if (!nds.backupDevice.isBackupDeviceAvailable()) {
-		return FALSE;
-	}
-	
-	return nds.backupDevice.exportData(filename) ? TRUE : FALSE;
-}
-
 EXPORTED BOOL desmume_gpu_get_layer_main_enable_state(int layer_index)
 {
     return GPU->GetEngineMain()->GetLayerEnableState(layer_index);

desmume/src/frontend/interface/interface.h

@@ -106,27 +106,6 @@ EXPORTED void desmume_savestate_slot_save(int index);
 EXPORTED BOOL desmume_savestate_slot_exists(int index);
 EXPORTED char* desmume_savestate_slot_date(int index);
 
-// Battery save (backup memory) import/export
-
-/**
- * Import battery save file with optional size override.
- * Supports .sav (raw), .dsv (DeSmuME), .duc (Action Replay), .dss (DSOrganize).
- * The emulator will automatically reset after successful import.
- * 
- * @param filename Path to battery save file
- * @param force_size Backup size in bytes (0 = auto-detect, or explicit size like 524288 for 512KB)
- * @return TRUE on success, FALSE on failure
- */
-EXPORTED BOOL desmume_backup_import_file(const char *filename, unsigned int force_size);
-
-/**
- * Export current battery save to .dsv file.
- * 
- * @param filename Destination path for .dsv file
- * @return TRUE on success, FALSE on failure
- */
-EXPORTED BOOL desmume_backup_export_file(const char *filename);
-
 EXPORTED BOOL desmume_gpu_get_layer_main_enable_state(int layer_index);
 EXPORTED BOOL desmume_gpu_get_layer_sub_enable_state(int layer_index);
 EXPORTED void desmume_gpu_set_layer_main_enable_state(int layer_index, BOOL the_state);