简化 libevent 编译

在 CMakePresets.json 的 cacheVariables 字段加入

{
    "EVENT__DISABLE_OPENSSL": "ON",
    "EVENT__DISABLE_BENCHMARK": "ON",
    "EVENT__DISABLE_TESTS": "ON",
    "EVENT__DISABLE_REGRESS": "ON",
    "EVENT__DISABLE_SAMPLES": "ON",
    "EVENT__LIBRARY_TYPE": "STATIC",
    "EVENT__MSVC_STATIC_RUNTIME": "OFF",
    "EVENT__DOXYGEN": "OFF"
}