Removed unused "--upstream" command line option.

auto/sources

@@ -74,7 +74,6 @@ NXT_LIB_SRCS=" \
     src/nxt_runtime.c \
     src/nxt_conf.c \
     src/nxt_conf_validation.c \
-    src/nxt_stream_module.c \
     src/nxt_main_process.c \
     src/nxt_worker_process.c \
     src/nxt_controller.c \
@@ -91,6 +90,7 @@ NXT_LIB_SRCS=" \
 NXT_LIB_SRC0=" \
     src/nxt_buf_filter.c \
     src/nxt_job_file.c \
+    src/nxt_stream_module.c \
     src/nxt_stream_source.c \
     src/nxt_upstream_source.c \
     src/nxt_http_source.c \