update patch for libzstd version 1.5.6

[macintoshplus]

To build the libzstd, a patch must be applied to change the output filename.

With v1.5.6, the patch does not work due to changes in the target file and another bug.

This patch is proposed to replace the actual patch. I have been building version 1.5.6 for ARM64.

[cmb69]

Thanks for the PR! It's overdue that we ship updated zstd.

I think we can do without having to drop support for somewhat older zstd versions, though. The fix for the broken resource compilation in zstd 1.5.6 (facebook/zstd#3999) could be moved to the builder like demonstrated in that ticket (works for 1.4.8 and 1.5.6 and likely other versions too). To be able to cleanly apply the existing patch, we could modify it to use only two lines of context; that seems to be sufficient in this case.

And in the long run we should use pkg-config for building PHP on Windows; that would allow to migrate away from any particular naming convention, so we have to apply fewer patches.

[cmb69]

See #33 for an alternative.