another attempt to not have stdint.h leak into the ed25519 source (which causes build failures on BSD)

git-svn-id: http://libtorrent.googlecode.com/svn@10150 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
merged fix from RC_1_0

git-svn-id: http://libtorrent.googlecode.com/svn@10151 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
use boost.cstdint.hpp instead of fixedint.h for ed25519 source

git-svn-id: http://libtorrent.googlecode.com/svn@10152 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
merged change from RC_1_0

git-svn-id: http://libtorrent.googlecode.com/svn@10153 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda