Fix: transition to make because CMake used the wrong linker

Credit to Łukasz Podkalicki for Makefile

CMakeLists.txt

@@ -1,21 +0,0 @@
-cmake_minimum_required(VERSION 3.21)
-set(CMAKE_SYSTEM_NAME Generic)
-set(CMAKE_C_STANDARD 99)
-project(vfdprog C)
-
-set(CMAKE_C_COMPILER avr-gcc)
-set(TARGET_CPU ATmega88)
-
-add_compile_definitions("__AVR_${TARGET_CPU}__")
-include_directories(/usr/lib/avr/include)
-set(CMAKE_C_FLAGS "-O3 -Wall")
-
-add_link_options(-Wl,--print-memory-usage)
-add_executable(${PROJECT_NAME} main.c PT6302.c PT6302.h)
-
-add_custom_target(
-        FLASH
-        avrdude -p ${TARGET_CPU} -c USBasp -v -U flash:w:${PROJECT_BINARY_DIR}/${PROJECT_NAME}:a
-        DEPENDS ${PROJECT_NAME}
-        COMMENT "Flash to ${TARGET_CPU}"
-)