Configure: Check if 128-bit integers are supported by compiler
Add a config variable "use_int128" to indicate if 128-bit integers are supported or not at the configure time. This makes it easier to automatically select 64-bit versus 32-bit implementation for curve448. Signed-off-by: NAmitay Isaacs <amitay@ozlabs.org> Reviewed-by: NTomas Mraz <tomas@openssl.org> Reviewed-by: NMatt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14784)
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