Constify deprecated bindings

[tkelman]

hopefully fixes auto_unbox: unable to determine argument type
ref #13107 (comment)

[tkelman]

Travis failure in pollfd looks unrelated

ERROR: LoadError: On worker 3:
LoadError: test failed: 0.002 <= 0.001665346
 in expression: intvl <= t_elapsed
 in error at ./error.jl:21
 in default_handler at test.jl:30
 in do_test at test.jl:53
 in pfd_tst_timeout at /tmp/julia/share/julia/test/pollfd.jl:59
 in anonymous at task.jl:443
 in sync_end at ./task.jl:388
 [inlined code] from task.jl:418
 in anonymous at no file:0
 in include_string at loading.jl:266
 in include_from_node1 at ./loading.jl:307
 [inlined code] from util.jl:179
 in runtests at /tmp/julia/share/julia/test/testdefs.jl:6
 in anonymous at multi.jl:892
 in run_work_thunk at multi.jl:645
 [inlined code] from multi.jl:892
 in anonymous at task.jl:59
while loading /tmp/julia/share/julia/test/pollfd.jl, in expression starting on line 65
while loading /tmp/julia/share/julia/test/runtests.jl, in expression starting on line 13
    From worker 3:       * pollfd               

[nalimilan]

The failure is #12824

[tkelman]

backported in #13182