fixed broken links

svn path=/branches/RC_1_33_0/boost/libs/smart_ptr/; revision=30431
Removed explicit register use (thanks to Howard Hinnant)

svn path=/branches/RC_1_33_0/boost/boost/detail/sp_counted_base_cw_ppc.hpp; revision=30585
Switched to 'int' since 'long' is 64 bits on PPC64

svn path=/branches/RC_1_33_0/boost/boost/detail/sp_counted_base_gcc_ppc.hpp; revision=30651