libgcrypt update corepure64 8.x

[Juanito]

A libgcrypt update in corepure64 8.x would have broken too many extensions, so it has been named libgcrypt2.

Please compile any updated or new extensions against libgcrypt2 and not against libgcrypt.

[Juanito]

Note that the recompilation of extensions that depend on libgcrypt is almost compete - the updated extension, libgcrypt2, has been renamed libgcrypt to overwrite the old extension in the corepure64-8.x repo, which has been renamed libgcrypt1.