fix darwin clang build

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9913 a83610d8-ad2a-0410-a6ab-fc0612d85776
extend lazy_bdecode unit test

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9914 a83610d8-ad2a-0410-a6ab-fc0612d85776
fixed bug in gunzip

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9915 a83610d8-ad2a-0410-a6ab-fc0612d85776
documentation fix

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9918 a83610d8-ad2a-0410-a6ab-fc0612d85776