remove build-common as submodule. This commit will not compile.
Squashed 'build-common/' content from commit 667edee

git-subtree-dir: build-common
git-subtree-split: 667edee87f3dc5d44ac2c131c414379bf2880d22
Merge commit '2aeebf19530aeef7fb63b0f65307fa2f35ed2155' as 'build-common'
update install information and FAQ