zlib: fix update-check

[Bnyro]

Testing the changes

• I tested the changes in this PR: YES

[Chocimier]

old pattern just works, why the change?

[Bnyro]

It doesn't work, it outputs there word be a 1213 release.

[Bnyro]

Because it doesn't handle dots properly.

[Chocimier]

?

./xbps-src update-check zlib      
using zlib/update overrides
fetching https://www.zlib.net and scanning with <B> zlib \K.+?(?=</B>)
fetching https://www.zlib.net/fossils/ and scanning with <B> zlib \K.+?(?=</B>)
found version 1.2.13

[Bnyro]

Oh, I just noticed the issue is when checking for updates for zlib-32bit, zlib itself works properly:

$ ./xbps-src update-check zlib-32bit
zlib-1.2.13 -> zlib-1213

But I don't really have a clue why it works properly for zlib in the meanwhile, don't they use the same template?

The changes in this PR don't have an impact on that, still claims to have a new 1213 release available.

[Chocimier]

update-check on -32bit packages is not an useful operation, as they are made from plain i686 build.
Going to details, this didn't work because xbps-src tries to read non-existent srcpkgs/zlib-32bit/update here.

[Bnyro]

Makes sense, thanks!