build/cmake: make using io_uring optional

CMakeLists.txt

@@ -33,6 +33,7 @@ option (OPENDHT_PROXY_CLIENT "Enable DHT proxy client, use Restinio and jsoncpp"
 option (OPENDHT_PROXY_OPENSSL "Build DHT proxy with OpenSSL" ON)
 CMAKE_DEPENDENT_OPTION(OPENDHT_HTTP "Build embedded http(s) client" OFF "NOT OPENDHT_PROXY_SERVER;NOT OPENDHT_PROXY_CLIENT" ON)
 option (OPENDHT_PEER_DISCOVERY "Enable multicast peer discovery" ON)
+option (OPENDHT_IO_URING "Use io_uring if available on the system (Linux only)" OFF)
 option (OPENDHT_INDEX "Build DHT indexation feature" OFF)
 option (OPENDHT_TESTS_NETWORK "Enable unit tests that require network access" ON)
 option (OPENDHT_C "Build C bindings" OFF)
@@ -107,7 +108,7 @@ if (NOT MSVC)
             )
             set(llhttp_target llhttp_static)
         else()
-            FetchContent_Declare(llhttp-local URL "https://github.com/nodejs/llhttp/archive/refs/tags/release/v9.2.0.tar.gz")
+            FetchContent_Declare(llhttp-local URL "https://github.com/nodejs/llhttp/archive/refs/tags/release/v9.2.1.tar.gz")
             if (BUILD_SHARED_LIBS)
                 set(BUILD_SHARED_LIBS ON CACHE INTERNAL "")
             else()
@@ -163,7 +164,7 @@ endif ()
 
 if (OPENDHT_HTTP OR OPENDHT_PEER_DISCOVERY)
     add_definitions(-DASIO_STANDALONE)
-    if (UNIX AND NOT APPLE)
+    if (OPENDHT_IO_URING AND UNIX AND NOT APPLE)
         pkg_search_module(liburing IMPORTED_TARGET liburing)
     endif ()
 endif()
@@ -407,7 +408,7 @@ else()
     if (OPENDHT_PROXY_OPENSSL)
         target_link_libraries(opendht PUBLIC PkgConfig::OPENSSL)
     endif()
-    if (liburing_FOUND)
+    if (OPENDHT_IO_URING AND liburing_FOUND)
         set(iouring_lib ", liburing")
         target_link_libraries(opendht PUBLIC PkgConfig::liburing)
         target_compile_definitions(opendht PUBLIC ASIO_HAS_IO_URING ASIO_DISABLE_EPOLL)