$OpenBSD$

remove cryptopp, enet from builtins

Index: externals/CMakeLists.txt
--- externals/CMakeLists.txt.orig
+++ externals/CMakeLists.txt
@@ -7,9 +7,6 @@ include(DownloadExternals)
 add_library(catch-single-include INTERFACE)
 target_include_directories(catch-single-include INTERFACE catch/single_include)
 
-# Crypto++
-add_subdirectory(cryptopp)
-
 # Dynarmic
 if (ARCHITECTURE_x86_64)
     # Dynarmic will skip defining xbyak if it's already defined, we then define it below
@@ -54,10 +51,6 @@ if (ARCHITECTURE_x86_64)
     target_include_directories(xbyak INTERFACE ./xbyak/xbyak)
     target_compile_definitions(xbyak INTERFACE XBYAK_NO_OP_NAMES)
 endif()
-
-# ENet
-add_subdirectory(enet)
-target_include_directories(enet INTERFACE ./enet/include)
 
 if (ENABLE_WEB_SERVICE)
     # LibreSSL