git: CVE-2022-23521 gitattributes parsing integer overflow

Backport from:

https://github.com/git/git/commit/eb22e7dfa23da6bd9aed9bd1dad69e1e8e167d24
https://github.com/git/git/commit/8d0d48cf2157cfb914db1f53b3fe40785b86f3aa
https://github.com/git/git/commit/24557209500e6ed618f04a8795a111a0c491a29c
https://github.com/git/git/commit/34ace8bad02bb14ecc5b631f7e3daaa7a9bba7d9
https://github.com/git/git/commit/447ac906e189535e77dcb1f4bbe3f1bc917d4c12
https://github.com/git/git/commit/e1e12e97ac73ded85f7d000da1063a774b3cc14f
https://github.com/git/git/commit/a60a66e409c265b2944f18bf43581c146812586d
https://github.com/git/git/commit/d74b1fd54fdbc45966d12ea907dece11e072fb2b
https://github.com/git/git/commit/dfa6b32b5e599d97448337ed4fc18dd50c90758f
https://github.com/git/git/commit/3c50032ff5289cc45659f21949c8d09e52164579



Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>