fix: Remove unnecessary wsock32 dependency on Windows

Looks like it was added by a mistake:

1. We didn't have this dependency before, in fact, autotools still
   doesn't have it, it was added only to CMake.

2. During my testing, when building the echo_bot example, there are no
   unresolved symbols left after linking against `libtox.a libsodium.a
   -pthread -lws2_32 -liphlpapi`, which indicates that `-lwsock32` is
   unnecessary.

Author: nurupo

CMakeLists.txt

@@ -454,7 +454,7 @@ elseif(TARGET Threads::Threads)
   set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} Threads::Threads)
 endif()
 if(WIN32)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} iphlpapi wsock32 ws2_32)
+  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} iphlpapi ws2_32)
 endif()
 
 ################################################################################