[gnutls-devel] GnuTLS | Mark arguments of function gnutls_x509_crt_equals2 as const (!1000)

[Development of GNU's TLS library]

Sorry for my lack of attention. It looks like `gnutls_datum_t` is a typedef to a struct, while `gnutls_x509_crt_t` is a typedef to pointer at the moment. Due to that, `const gnutls_datum_t*` is a pointer to const data, while `const gnutls_x509_crt_t` is a const pointer to data. That explains lack of expected warnings (const pointer is just copied as non-const pointer for function argument when needed) and makes this change more trivial (there is no point in marking such pointers as const, it's a copy anyway). Changes to libtasn are not required, as shouldn't be required changes to any other functions since they're not called with provided `const gnutls_datum_t*`. It should be enough to change `gnutls_datum_t * der` to `const gnutls_datum_t * der`.

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