Fix build under clang
Fix build under clang

librsync/librsync,sourcefrog/librsync,yrgoldteeth/librsync,dbaarda/librsync,dbaarda/librsync,librsync/librsync,yrgoldteeth/librsync,yrgoldteeth/librsync,sourcefrog/librsync,librsync/librsync,yrgoldteeth/librsync,sourcefrog/librsync,dbaarda/librsync,Salamek/librsync,Salamek/librsync,sourcefrog/librsync,Salamek/librsync,dbaarda/librsync,librsync/librsync