If the installation of buildtools fails then we should fail the entire
installation instead of blindly continuing on.
(From OE-Core master rev: 34bb63e6c72fb862e0ef0d2b26e1bfddaf7ddb99)
(From OE-Core rev: 696979ef39fbd85fa74cfb4a0cbee49b045e2d92)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>