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

This patch includes packaging changes related to files move.

go/nxt_cgo_lib.h

@@ -0,0 +1,40 @@
+
+/*
+ * Copyright (C) Max Romanov
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_CGO_LIB_H_INCLUDED_
+#define _NXT_CGO_LIB_H_INCLUDED_
+
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+typedef struct {
+    int  length;
+    char  *start;
+} nxt_cgo_str_t;
+
+int nxt_cgo_run(uintptr_t handler);
+
+int nxt_cgo_response_create(uintptr_t req, int code, int fields,
+    uint32_t fields_size);
+
+int nxt_cgo_response_add_field(uintptr_t req, uintptr_t name, uint8_t name_len,
+    uintptr_t value, uint32_t value_len);
+
+int nxt_cgo_response_send(uintptr_t req);
+
+ssize_t nxt_cgo_response_write(uintptr_t req, uintptr_t src, uint32_t len);
+
+ssize_t nxt_cgo_request_read(uintptr_t req, uintptr_t dst, uint32_t dst_len);
+
+int nxt_cgo_request_close(uintptr_t req);
+
+void nxt_cgo_request_done(uintptr_t req, int res);
+
+void nxt_cgo_warn(uintptr_t msg, uint32_t msg_len);
+
+#endif /* _NXT_CGO_LIB_H_INCLUDED_ */