$NetBSD$

* socket and nsl needed for networking on Solaris

--- libcaf_io/CMakeLists.txt.orig	2021-07-16 09:33:16.000000000 +0000
+++ libcaf_io/CMakeLists.txt
@@ -10,6 +10,8 @@ caf_add_component(
     PUBLIC
       CAF::core
       $<$<CXX_COMPILER_ID:MSVC>:ws2_32>
+      $<$<PLATFORM_ID:SunOS>:socket>
+      $<$<PLATFORM_ID:SunOS>:nsl>
     PRIVATE
       CAF::internal
   ENUM_CONSISTENCY_CHECKS