Don't error when initializing LibGit2 with CA roots path #56924
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When e.g. SSL_CERT_FILE is set, we cannot set this location in LibGit2_jll because it isn't built with support for that. Until now we've errored out with a message telling users to set JULIA_SSL_CA_ROOTS_PATH to an empty string.
This changes the behavior to allow this expected error. Variables like SSL_CERT_FILE are for instance set by Conda, ensuring many people running into this, see e.g. https://discourse.julialang.org/search?q=JULIA_SSL_CA_ROOTS_PATH.
The other part, and some more context for this, is here: JuliaLang/NetworkOptions.jl#37 (comment). With this fix I can run e.g.
add Example#main
in julia despite SSL_CERT_FILE being set.