Go: moving source files to the root of the project.

This patch includes packaging changes related to files move.

go/ldflags-lrt.go

@@ -0,0 +1,13 @@
+// +build linux netbsd
+
+/*
+ * Copyright (C) Max Romanov
+ * Copyright (C) NGINX, Inc.
+ */
+
+package unit
+
+/*
+#cgo LDFLAGS: -lrt
+*/
+import "C"