cipher:kem:ecc: Raise an error by validating a point on curve.
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Description

cipher:kem:ecc: Raise an error by validating a point on curve.

* cipher/ecc-ecdh.c (_gcry_ecc_curve_mul_point): Add new argument
ENABLE_MONT_CHECK to enable check for Montgomery curve.  Add point
validation.  Raise GPG_ERR_INV_DATA on failure.
(_gcry_ecc_mul_point): Call _gcry_ecc_curve_mul_point with Montgomery
curve check disabled.
* cipher/kem-ecc.c (ecc_mul_point): Call _gcry_ecc_curve_mul_point
with Montgomery curve check enabled.
* src/gcrypt-int.h (_gcry_ecc_curve_mul_point): Change the proto.

Reported by Calif.io in collaboration with Claude and Anthropic
Research.