chore: remove old async example

Author: ensh63

.github/workflows/nginx.yaml

@@ -49,7 +49,6 @@ env:
 
   NGX_TEST_FILES: examples/t
   NGX_TEST_GLOBALS_DYNAMIC: >-
-    load_module ${{ github.workspace }}/nginx/objs/ngx_http_async_module.so;
     load_module ${{ github.workspace }}/nginx/objs/ngx_http_async_request_module.so;
     load_module ${{ github.workspace }}/nginx/objs/ngx_http_awssigv4_module.so;
     load_module ${{ github.workspace }}/nginx/objs/ngx_http_curl_module.so;

examples/Cargo.toml

@@ -49,11 +49,6 @@ name = "upstream"
 path = "upstream.rs"
 crate-type = ["cdylib"]
 
-[[example]]
-name = "async"
-path = "async.rs"
-crate-type = ["cdylib"]
-
 [[example]]
 name = "async_request"
 path = "async_request.rs"

examples/async.conf

@@ -15,14 +15,6 @@ if [ $HTTP = YES ]; then
     ngx_rust_target_type=EXAMPLE
     ngx_rust_target_features=
 
-    if :; then
-        ngx_module_name=ngx_http_async_module
-        ngx_module_libs="-lm"
-        ngx_rust_target_name=async
-
-        ngx_rust_module
-    fi
-
     if :; then
         ngx_module_name=ngx_http_async_request_module
         ngx_module_libs=