Test fails on Julia master (1.4) due to changes in internal (renaming jl_gc_total_bytes)

[KristofferC]

Due to change in some internals (JuliaLang/julia#33717) the tests here now fail with

Cfunction: Error During Test at /home/pkgeval/.julia/packages/CBinding/iXfy4/test/cfunction.jl:3
  Got exception outside of a @test
  could not load symbol "jl_gc_total_bytes":
  /opt/julia/bin/../lib/libjulia.so.1: undefined symbol: jl_gc_total_bytes

It is probably enough to just adapt the test at

CBinding.jl/test/cfunction.jl

Lines 19 to 23 in 309ddce

	f2 = Cfunction{Clong, Tuple{}}(lib, :jl_gc_total_bytes)
	@test eltype(f2) <: Cfunction{Clong, Tuple{}}
	@test typeof(f2()) === Clong
	@test f2() isa Clong
	@test_throws MethodError f2("no arguments, please!")

to the new name + signature of the function.