Description of problem:

Consider adding bcrypt (or scrypt) support in libxcrypt

References:

https://access.redhat.com/articles/1519843
https://sourceware.org/bugzilla/show_bug.cgi?id=2100
https://github.com/besser82/libxcrypt/issues/104
https://github.com/besser82/libxcrypt/pull/113
https://github.com/besser82/libxcrypt/pull/150
https://github.com/linux-pam/linux-pam/issues/45
https://github.com/linux-pam/linux-pam/pull/84

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