Add alternative URLs for downloading deps (#80)

cmake/asio.cmake

@@ -2,6 +2,7 @@ function(download_asio)
   include(FetchContent)
 
   set(asio_URL  "https://github.com/chriskohlhoff/asio/archive/refs/tags/asio-1-24-0.tar.gz")
+  set(asio_URL2  "https://huggingface.co/csukuangfj/sherpa-onnx-cmake-deps/resolve/main/asio-asio-1-24-0.tar.gz")
   set(asio_HASH "SHA256=cbcaaba0f66722787b1a7c33afe1befb3a012b5af3ad7da7ff0f6b8c9b7a8a5b")
 
   # If you don't have access to the Internet,
@@ -22,7 +23,9 @@ function(download_asio)
   endforeach()
 
   FetchContent_Declare(asio
-    URL               ${asio_URL}
+    URL
+      ${asio_URL}
+      ${asio_URL2}
     URL_HASH          ${asio_HASH}
   )