Fixes [YOCTO #12760]
Updated the cmake.bbclass description to tell what directory
to insall custom CMake toolchain files into. Also, updated
the two areas in the "Writing a New Recipe" section that
mention CMake. Placed a couple notes there concerning the
same directory stuff.
(From yocto-docs rev: a65cd2c4c062d4ae388191b9d6708b4fadffaa3f)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>