Improve libgit2 build reliability - #97

The following openssl@3 configuration files have not been removed! If desired, remove them manually with `rm -rf`: /opt/homebrew/etc/openssl@3 /opt/homebrew/etc/openssl@3/cert.pem /opt/homebrew/etc/openssl@3/certs /opt/homebrew/etc/openssl@3/certs/.keepme /opt/homebrew/etc/openssl@3/ct_log_list.cnf /opt/homebrew/etc/openssl@3/ct_log_list.cnf.dist /opt/homebrew/etc/openssl@3/misc /opt/homebrew/etc/openssl@3/misc/CA.pl /opt/homebrew/etc/openssl@3/misc/tsget /opt/homebrew/etc/openssl@3/misc/tsget.pl /opt/homebrew/etc/openssl@3/openssl.cnf /opt/homebrew/etc/openssl@3/openssl.cnf.dist /opt/homebrew/etc/openssl@3/private /opt/homebrew/etc/openssl@3/private/.keepme