Use SYSTEM to declare includes (prevent warnings)

Author: CodeFinder2

CMakeLists.txt

@@ -5,8 +5,7 @@ project("fast-cpp-csv-parser" VERSION 1.0.0
 include(GNUInstallDirs)
 
 add_library(${PROJECT_NAME} INTERFACE)
-target_include_directories(
-  ${PROJECT_NAME}
+target_include_directories(${PROJECT_NAME} SYSTEM
   INTERFACE $<BUILD_INTERFACE:${${PROJECT_NAME}_SOURCE_DIR}/include>
             $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_11)