libgit2 test failure Unsupported URL protocol

[JeffBezanson]

I'm seeing this:

    JULIA test/libgit2
     * libgit2              ERROR: LoadError: LoadError: GitError(Code:ERROR, Class:Net, Unsupported URL protocol)
 [inlined code] from libgit2/error.jl:96
 in clone at libgit2/repository.jl:95
 in clone at libgit2.jl:303
 in anonymous at /home/jeff/src/julia/test/libgit2.jl:72
 in temp_dir at /home/jeff/src/julia/test/libgit2.jl:62
 in temp_dir at /home/jeff/src/julia/test/libgit2.jl:57
 in include at ./boot.jl:261
 in include_from_node1 at ./loading.jl:304
 [inlined code] from util.jl:179
 in runtests at /home/jeff/src/julia/test/testdefs.jl:178
 in anonymous at multi.jl:684
 in run_work_thunk at multi.jl:645
 in remotecall_fetch at multi.jl:718
 in remotecall_fetch at multi.jl:734
 [inlined code] from multi.jl:1430
 in anonymous at task.jl:1429
while loading /home/jeff/src/julia/test/libgit2.jl, in expression starting on line 69
while loading /home/jeff/src/julia/test/runtests.jl, in expression starting on line 13

[yuyichao]

Dup of #13389 ?

[wildart]

yes