Test breakage with zlib-ng

Hi everyone,

As some might have heard, there is a proposal for Fedora 40 to transition from zlib to zlib-ng[0]. Because of this, there has been a rebuild of all packages to ensure every package works under zlib-ng.

Git test suit has three breakages in t6300-for-each-ref.sh. To be precise, it is:

not ok 35 - basic atom: refs/heads/main objectsize:disk not ok 107 - basic atom: refs/tags/testtag objectsize:disk not ok 108 - basic atom: refs/tags/testtag *objectsize:disk

All of these tests are atomic, and they compare the result against $disklen. I discussed it with Tulio Magno Quites Machado Filho, who ran the tests and is owner of the proposal. It seems like the compression of zlib-ng is shaving/adding some bytes to the actual output, which then fails the comparison.

Here is an example:

``` expecting success of 6300.35 'basic atom: refs/heads/main objectsize:disk': git for-each-ref --format="%($format)" "$ref" >actual && sanitize_pgp <actual >actual.clean && test_cmp expected actual.clean

++ git for-each-ref '--format=%(objectsize:disk)' refs/heads/main ++ sanitize_pgp ++ perl -ne ' /^-----END PGP/ and $in_pgp = 0; print unless $in_pgp; /^-----BEGIN PGP/ and $in_pgp = 1; ' ++ command /usr/bin/perl -ne ' /^-----END PGP/ and $in_pgp = 0; print unless $in_pgp; /^-----BEGIN PGP/ and $in_pgp = 1; ' ++ test_cmp expected actual.clean ++ test 2 -ne 2 ++ eval 'diff -u' '"$@"' +++ diff -u expected actual.clean --- expected 2023-12-06 21:06:07.808849497 +0000 +++ actual.clean 2023-12-06 21:06:07.812849541 +0000