Add ccache as a native tool and put its recipe files to:
'meta/recipes-devtools/ccache'.
(From OE-Core rev: 43416be5ccb66f93e395fdd8d0e19327f848cbe2)
Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>