Log Message:
libgit2: update to 1.6.4.

1.6.4

Bug fixes

    config: return GIT_ENOTFOUND for missing programdata by @ethomson in #6547

1.6.3

Bug fixes

    odb: restore git_odb_open by @ethomson in #6520
    Ensure that git_index_add_all handles ignored directories by @ethomson in #6521
    pack: use 64 bits for the number of objects by @carlosmn in #6530

Build and CI improvements

    Remove unused wditer variable by @georgthegreat in #6518
    fs_path: let root run the ownership tests by @ethomson in #6513
    sysdir: Do not declare win32 functions on non-win32 platforms by @Batchyx in \ 
#6527
    cmake: don't include include/git2 by @ethomson in #6529

1.6.2

Bug fixes

    remote: always populate old id in update tips by @ethomson in #6506
    The update tips callback would not always be properly provided with an empty \ 
(0000000...) OID for new refs.

    Revert #6503 by @ethomson in #6511
    The certificate callback added port information for callbacks in #6503, but \ 
the format was ambiguous with IPv6 addresses. Revert this change temporarily.

    Add git_odb_backend_loose back by @ethomson in #6512
    During SHA256 refactoring, the git_odb_backend_loose API was accidentally \ 
removed. Add it back.

    meta: configure pkg-config .pc correctly by @ethomson in #6514
    During SHA256 refactoring, the pkg-config .pc file was erroneously renamed \ 
to git2 instead of libgit2. Repair this.

1.6.1

This is release v1.6.1, "Hubbeliges Krokodil". This release adds
experimental SHA256 support and includes many new features and
bugfixes. This release replaces libgit2 v1.6.0, which did not
correctly update its version number(s).