Revert "Removed web service reminiscents" in preparation to fix multiplayer lobby list

This reverts commit ffc907460f.

externals/CMakeLists.txt

@@ -133,11 +133,19 @@ endif()
 add_subdirectory(sirit)
 
 # httplib
-if (NOT TARGET httplib::httplib)
+if (ENABLE_WEB_SERVICE AND NOT TARGET httplib::httplib)
     set(HTTPLIB_REQUIRE_OPENSSL ON)
     add_subdirectory(cpp-httplib)
 endif()
 
+# cpp-jwt
+if (ENABLE_WEB_SERVICE AND NOT TARGET cpp-jwt::cpp-jwt)
+    set(CPP_JWT_BUILD_EXAMPLES OFF)
+    set(CPP_JWT_BUILD_TESTS OFF)
+    set(CPP_JWT_USE_VENDORED_NLOHMANN_JSON OFF)
+    add_subdirectory(cpp-jwt)
+endif()
+
 # Opus
 if (NOT TARGET Opus::opus)
     set(OPUS_BUILD_TESTING OFF)