Disable function thunking when importing

Thunked functions can confuse the delinker extension into thinking that
multiple symbols have the same name and lead to delinking failures (with
no diagnostic, conveniently).

ghidra/ghidra_scripts/EnhancedImport.java

@@ -178,6 +178,10 @@ public class EnhancedImport extends GhidraScript {
 		final Function f = Optional.ofNullable(getFunctionAt(addr))
 		                           .orElse(createFunction(addr, parts[6]));
 
+		// Thunks trip up the delinker extension by making it see
+		// duplicate symbol names
+		f.setThunkedFunction(null);
+
 		f.setReturnType(
 			makeType(parts[2], unknownTypes).orElse(Undefined4DataType.dataType),
 			SourceType.USER_DEFINED