build: compilar pack_resources con C++20 en tools/Makefile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/Makefile

@@ -14,7 +14,7 @@ PACK_INCLUDES  := -I$(DIR_ROOT)
 
 # Compilador y flags
 CXX            := g++
-CXXFLAGS       := -std=c++17 -Wall -Os -ffunction-sections -fdata-sections
+CXXFLAGS       := -std=c++20 -Wall -Os -ffunction-sections -fdata-sections
 
 # Variables específicas por sistema operativo
 ifeq ($(OS),Windows_NT)