Fixes [YOCTO #4753]
Minor review edits to this buildtools section. Additionally, I
removed the "-y" argument from the CentOS package install
commands.
(From yocto-docs rev: 8f5991f7d3a5ceee63a022af19afd713dcf740c3)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>