Properly link flecs library

engine/libs/flecs/examples/cpp/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.5)
+cmake_policy(SET CMP0063 NEW)
+
+project(flecs_cpp_examples LANGUAGES CXX)
+
+set(FLECS_DIR ../..)
+set(CUR_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+add_subdirectory(${FLECS_DIR} ${CMAKE_CURRENT_BINARY_DIR}/flecs)
+
+include(../../cmake/target_default_compile_options.cmake)
+include(../../cmake/target_default_compile_warnings.cmake)
+include(../../cmake/target_default_compile_functions.cmake)
+
+list_targets(EXAMPLES)
+
+foreach (EXAMPLE ${EXAMPLES})
+    create_target_cxx(${EXAMPLE} "")
+    create_target_cxx(${EXAMPLE} "static")
+endforeach ()