Allow sign extension in OSSL_PARAM_allocate_from_text()
Allow sign extension in OSSL_PARAM_allocate_from_text()

This is done for the data type OSSL_PARAM_INTEGER by checking if the
most significant bit is set, and adding 8 to the number of buffer bits
if that is the case.  Everything else is already in place.

Fixes #17103

Reviewed-by: Tomas Mraz <2bc6038c3dfca09b2da23c8b6da8ba884dc2dcc2@openssl.org>
Reviewed-by: Paul Dale <ddec78389666b4f7c9b4d110380c848489a3e4aa@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17104)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl