fix #239 simplifying config file and make possible use the module as a dynamic one

config

-ngx_feature="http_push_stream_module"
-ngx_feature_name=
-ngx_feature_run=no
-ngx_feature_incs=
-ngx_feature_path=
-ngx_feature_libs=
-ngx_feature_test=
-
 ngx_addon_name=ngx_http_push_stream_module
-HTTP_MODULES="$HTTP_MODULES ngx_http_push_stream_module"
-CORE_INCS="$CORE_INCS \
-    $ngx_addon_dir/src \
-    $ngx_addon_dir/include"
-NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
-    ${ngx_addon_dir}/src/ngx_http_push_stream_module.c"
+CORE_INCS="$CORE_INCS ${ngx_addon_dir}/src ${ngx_addon_dir}/include"
+
+if test -n "$ngx_module_link"; then
+    ngx_module_type=HTTP
+    ngx_module_name=${ngx_addon_name}
+    ngx_module_srcs="${ngx_addon_dir}/src/${ngx_addon_name}.c"
+
+    . auto/module
+else
+    HTTP_MODULES="$HTTP_MODULES ${ngx_addon_name}"
+    NGX_ADDON_SRCS="$NGX_ADDON_SRCS ${ngx_addon_dir}/src/${ngx_addon_name}.c"
+fi
 
 have=NGX_HTTP_HEADERS . auto/have
 . auto/feature