Log Message:
Updated to latest release, 0.20.0. EXTRACT_USING=gtar. Release changelog:

Internal changes

    Added support for decomposed Unicode paths in Mac OS X
    Added support for junctions in win32
    Fixed issues with HTTP redirects in the network stack
    Performance improvements (as always)

git2/blame.h

    added full support for blame operations

git2/blob.h

    added git_blob_filtered_content to load blobs in memory with their \ 
corresponding filters applied

git2/branch.h

    added branch iterators as an alternative to the callback-based API

git2/buffer.h

    exported the git_buf struct to allow binary buffers to be passed from/to the \ 
library. This simplifies several APIs

git2/checkout.h

    implemented additional checkout options ('skip unmerged', 'use ours' and \ 
'use theirs')

git2/clone.h

    simplified the clone API
    added new git_clone_into to clone into an existing (empty) repository

git2/commit.h

    added APIs to access the raw (uncleaned) text of a commit message

git2/common.h

    added global options to set the default paths to load templates from

git2/config.h

    added multivar iterators
    added globbing iterator
    added git_config_foreach_match to perform operations on every single var in \ 
a config file

git2/diff.h

    restructured and simplified the diff API

git2/filter.h

    added external APIs to configure and apply custom filters to checked out blobs

git2/index.h

    git_index_read can now force a reload of the index file even if it hasn't \ 
changed on-disk

git2/indexer.h

    improved the streaming indexer APIs

git2/merge.h

    added support for merge!

git2/object.h

    added helper API to lookup a generic object by path

git2/pack.h

    added progress callbacks to the packbuilder

git2/patch.h

    added support for patch generation as part of the Diff API revamp

git2/pathspec.h

    added helper APIs to work with pathspecs and match files in the workdir or diffs

git2/push.h

    added progress callbacks to push

git2/reflog.h

    changed reflog APIs to work on reference names instead of the references \ 
themselves, so they become less racy

git2/remote.h

    added support for setting refspecs on remotes, either at creation or on \ 
existing ones
    simplified the remotes API

git2/revwalk.h

    add API to simplify parents during a walk

git2/signature.h

    add helper to create a signature with the default values for a repository \ 
(i.e. the set user.name and user.email values, and the current time)

git2/submodules.h

    improve the status detection for submodules

git2/sys/

    exported many new internal APIs, such as pluggabe transport APIs