Log Message:
Update libgit2 to 0.24.1.

pkgsrc changes:

- re-enable libssh2 support
- ensure pkgsrc curl and http-parser are picked up and enabled

Upstream changes:

2f2575c Updating http parser to accept a `+` in the schema
ff8e3f0 Handle git+ssh:// and ssh+git:// protocols support
fa8b1a8 Adding spec coverage for ssh+git and git+ssh protocols
429155d Updating change to http_parser to reflect PR for nodejs/http-parser
e44f658 Removing #define for SSH_PREFIX_COUNT and using ARRAY_SIZE instead
b8dc15f Adding test cases that actually test the functionality of the new transport
4a93a7f Tabs
8ec3d88 Avoid subtraction overflow in git_indexer_commit
e3862c9 Buffer sideband packet data
cdded63 Remove duplicated calls to git_mwindow_close
eb09ead odb: improved not found error messages
9ee498e Only buffer if necessary.
4ebf745 mwindow: free unused windows if we fail to mmap
ffb1f41 describe: handle error code returned by git_pqueue_insert
e39ad74 config_file: handle missing quotation marks in section header
0370dae Check for __CLANG_INTTYPES_H
faf823d tests: transport: fix memory leaks with registering transports
fa4b93a backport git_oid__cpy_prefix
d0780b8 object: avoid call of memset with ouf of bounds pointer
e114bba index: assert required OID are non-NULL
1a16e8b pack-objects: fix memory leak on overflow
d96c063 submodule: avoid passing NULL pointers to strncmp
851c51a diff_tform: fix potential NULL pointer access
0b357e2 coverity: report errors when uploading tarball
8d3ee96 refdb_fs: fail if refcache returns NULL pointer
dd78d7d blame_git: handle error returned by `git_commit_parent`
f17ed63 blame: handle error when resoling HEAD in normalize_options
18c4ae7 filebuf: handle write error in `lock_file`
89e7604 config_cache: check return value of `git_config__lookup_entry`
c1ec732 Setup better defaults for OpenSSL ciphers
4e91020 Start error string with lower case character
cdde081 Use general cl_git_fail because the error is generic
f587f38 CMake: do not overwrite but only append to CMAKE_C_FLAGS_DEBUG
9a668ab Option "LIBGIT2_PREFIX" to set the CMAKE's TARGET_PROPERTIES PREFIX
d8fcafb Split the page size from the mmap alignment
e97d2d7 commit: fix extraction of single-line signatures
a1cf264 win32: free thread-local data on thread exit
c86a65b config: don't special-case multivars that don't exist yet
3ec0f2e xdiff/xprepare: use the XDF_DIFF_ALG() macro to access flag bits
56da07c xdiff/xprepare: fix a memory leak
fe1f477 Add a no-op size_t typedef for the doc parser
ab062a3 tests: fix core/stream test when built with openssl off
3e2e824 refs: provide a more general error message for dwim
ba52879 reset: use real ids for the tests
b6130fe refs::create: strict object creation on by default
e8d5df9 config: show we write a spurious duplicated section header
a13c1ec config: don't write section header if we're in it
21d8832 config::write::repeated: init our buffer
1778908 ignore: don't use realpath to canonicalize path
26f2cef tree: re-use the id and filename in the odb object
13ebf7b tree: store the entries in a growable array
af753ab tree: drop the now-unnecessary entries vector
1d59c85 status: update test to include valid OID
5cc7a5c tests: skip the unreadable file tests as root
2c1bc36 Plug a few leaks
6a35e74 leaks: fix some leaks in the tests
ccfacb8 leaks: call `xdl_free_classifier`
8edadbf index::racy: force racy entry