Remove workaround forcing rsa mpint to exactly a 8 bits multiple for putty (see

http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/rsa-non8mult-verify-fail.html ,
was fixed in 2004)

--HG--
extra : convert_revision : f21045c791002d81fc6b8dde6537ea481e513eb2