move build system to use conan cmake_find_package generator

examples/simple_system/CMakeLists.txt

@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.12)
+find_package(Boost COMPONENTS program_options REQUIRED)
 add_executable (simple_system 
     plic.cpp
     uart.cpp
@@ -9,6 +10,9 @@ add_executable (simple_system
     sc_main.cpp
 )
 target_link_libraries (simple_system LINK_PUBLIC scc)
-target_link_libraries (simple_system LINK_PUBLIC ${Boost_LIBRARIES} )
-
+if(TARGET Boost::program_options)
+	target_link_libraries(simple_system PUBLIC Boost::program_options)
+else()
+	target_link_libraries(simple_system PUBLIC ${BOOST_program_options_LIBRARY})
+endif()
 add_test(NAME simple_system_test COMMAND simple_system)