Build fixes for compiling as a dynamic module (#12)

Allow build as a dynamic module.

Author: akatrevorjay

config

@@ -1,7 +1,27 @@
-have=NGX_STREAM_UPSYNC . auto/have
 ngx_addon_name=ngx_stream_upsync_module
-STREAM_MODULES="$STREAM_MODULES ngx_stream_upsync_module"
-NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/src/ngx_stream_upsync_module.c $ngx_addon_dir/src/ngx_stream_json.c $ngx_addon_dir/src/ngx_stream_http_parser.c"
-NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/src/ngx_stream_upsync_module.h $ngx_addon_dir/src/ngx_stream_json.h $ngx_addon_dir/src/ngx_stream_http_parser.h"
+
 ngx_feature_libs="-lm"
-CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+
+ngx_module_incs=$ngx_addon_dir/src
+
+_STREAM_UPSYNC_SRCS="\
+  $ngx_addon_dir/src/ngx_stream_upsync_module.c \
+  $ngx_addon_dir/src/ngx_stream_json.c \
+  $ngx_addon_dir/src/ngx_stream_http_parser.c \
+"
+
+have=NGX_STREAM_UPSYNC . auto/have
+
+if test -n "$ngx_module_link"; then
+  ngx_module_type=STREAM
+  ngx_module_name=$ngx_addon_name
+  ngx_module_srcs="$_STREAM_UPSYNC_SRCS"
+  ngx_module_libs=$ngx_feature_libs
+  . auto/module
+else
+  NGX_ADDON_SRCS="$NGX_ADDON_SRCS $_STREAM_UPSYNC_SRCS"
+  CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
+  CORE_INCS="$CORE_INCS $ngx_module_incs"
+  STREAM_MODULES="$STREAM_MODULES $ngx_addon_name"
+fi
+