CMake: Propagate cpp-optparse include directories automatically

Source/Common/CMakeLists.txt

@@ -18,6 +18,5 @@ endif()
 
 add_library(${NAME} STATIC ${SRCS})
 target_link_libraries(${NAME} FEXCore_Base cpp-optparse tiny-json FEXHeaderUtils)
-target_include_directories(${NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/External/cpp-optparse/)
 target_include_directories(${NAME} PRIVATE ${CMAKE_BINARY_DIR}/generated)
 target_include_directories(${NAME} PRIVATE ${CMAKE_SOURCE_DIR}/External/xbyak/)

Source/Tools/pidof/CMakeLists.txt

@@ -1,7 +1,4 @@
 add_executable(FEXpidof pidof.cpp)
-target_include_directories(FEXpidof
-  PRIVATE
-  ${PROJECT_SOURCE_DIR}/Source/Common/cpp-optparse/)
 
 target_link_libraries(FEXpidof
   PRIVATE