feat: add header dependency tracking for programs

programs/src/tcc/Makefile

@@ -114,11 +114,11 @@ $(TARGET): $(ALL_OBJS) $(LIBDIR)/libc/liblibc.a
 
 $(OBJDIR)/%.o: %.c Makefile config.h montauk_compat.h
 	@mkdir -p $(OBJDIR)
-	$(CC) $(CFLAGS) -c $< -o $@
+	$(CC) $(CFLAGS) -MMD -MP -c $< -o $@
 
 $(OBJDIR)/%.o: %.S Makefile
 	@mkdir -p $(OBJDIR)
-	$(CC) $(CFLAGS) -c $< -o $@
+	$(CC) $(CFLAGS) -MMD -MP -c $< -o $@
 
 $(SHARED_CRT_DIR)/liblibc.a $(SHARED_CRT_DIR)/crt1.o $(SHARED_CRT_DIR)/crti.o $(SHARED_CRT_DIR)/crtn.o:
 	$(MAKE) -C $(SHARED_CRT_DIR)
@@ -141,3 +141,6 @@ $(CRT_DIR)/libc.a: $(LIBDIR)/libc/liblibc.a
 
 clean:
 	rm -rf $(OBJDIR) $(TARGET)
+
+# Auto-generated header dependency tracking (-MMD -MP).
+-include $(TCC_OBJS:.o=.d) $(COMPAT_OBJS:.o=.d)