Fix flocking bug

cmake/targets/linux.cmake

@@ -16,6 +16,9 @@ else()
   )
 endif()
 
+# Export symbols so backtrace_symbols() can resolve function names.
+target_link_options(${DUSK_LIBRARY_TARGET_NAME} PUBLIC -rdynamic)
+
 # Link required libraries.
 target_link_libraries(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
   SDL2