* libatomic build before boem-gc

git-svn-id: https://svn.exactcode.de/t2/trunk@42421 c5f82cb5-29bc-0310-9cd0-bff59a50e3bc
	* add erlang to stage 0
	  need in cross compile build

git-svn-id: https://svn.exactcode.de/t2/trunk@42422 c5f82cb5-29bc-0310-9cd0-bff59a50e3bc
	* erlang: set the sysroot folder for cross compile

git-svn-id: https://svn.exactcode.de/t2/trunk@42423 c5f82cb5-29bc-0310-9cd0-bff59a50e3bc