Signed-off-by: schu <schu-github@schulog.org>

Ensure that all memory related functions (malloc, calloc, strdup, free,
etc) are using their respective `git__` wrappers.

1. The license header is technically not valid if it doesn't have a
copyright signature.

2. The COPYING file has been updated with the different licenses used in
the project.

3. The full GPLv2 header in each file annoys me.

This will make libgit2 more suitable for embedding.

Given that the sha1.h header file should never be included into
any other file, since it represents an implementation detail of
hash.c, we remove the header and inline it's content.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

Since block-sha1 from git.git has such excellent performance, we
can also get rid of the openssl dependency. It's rather simple
to add it back later as an optional extra, but we really needn't
bother to pull in the entire ssl library and have to deal with
linking issues now that we have the portable and, performance-wise,
truly excellent block-sha1 code to fall back on.

Since this requires a slight revamp of the build rules anyway, we
take the opportunity to fix including EXTRA_OBJS in the final build
as well.

The block-sha1 code was originally implemented for git.git by
Linus Torvalds <torvalds@linux-foundation.org> and was later
polished by Nicolas Pitre <nico@cam.org>.

Signed-off-by: Andreas Ericsson <ae@op5.se>