dl: move 'example' to 'examples/dynamic_library_loading' (#9187)

examples/dynamic_library_loading/modules/library/library.v

@@ -0,0 +1,19 @@
+module library
+
+// add_1 is exported with the C name `add_1`.
+// It can be called by external programs, when the module is compiled
+// as a shared library.
+// It is exported, because the function is declared as public with `pub`.
+// The exported C name is `add_1`, because of the export: tag.
+// (Normally, the exported name is a V mangled version based on the module
+// name followed by __, followed by the fn name, i.e. it would have been
+// `library__add_1`, if not for the export: tag).
+[export: 'add_1']
+pub fn add_1(x int, y int) int {
+	return my_private_function(x + y)
+}
+
+// this function is not exported and will not be visible to external programs.
+fn my_private_function(x int) int {
+	return 1 + x
+}