buildroot 重新編譯 package

/*************************************************************************
 *                   buildroot 重新編譯 package 
 * 說明：
 *     修改了buildroot中的busybox，但不知道要怎么重新編譯，記錄一下資料。
 *
 *                                      2017-1-16 深圳 南山平山村 曾劍鋒
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一、參考文檔：
    1. buildroot重新編譯package
        http://bbs.chinaunix.net/thread-3759058-1-1.html
    2. Chapter 5. Understanding how to rebuild packages
        http://free-electrons.com/~thomas/buildroot/manual/html/ch05.html

二、操作方法介紹：
For packages relying on Buildroot packages infrastructures (see this section ??? for details), the following stamp files are relevant:
    1. output/build/packagename-version/.stamp_configured. If removed, Buildroot will trigger the recompilation of the package from the configuration step (execution of ./configure).
    2. output/build/packagename-version/.stamp_built. If removed, Buildroot will trigger the recompilation of the package from the compilation step (execution of make).