Support for masking a specific algorithm

[jjjighg]

I am currently using GmSSL-v2+ uadk_engine and I have some errors while compiling the uadk_engine with the following error message

uadk_pkey.c:35:2: error: 'EVP_PKEY_X448' undeclared here (not in a function); did you mean 'EVP_PKEY_sign'?

GmSSL-v2 does not currently support x448 algorithm, so I hope that a certain algorithm can be masked through configuration in the uadk_engine, so can uadk_engine support masking of a certain algorithm?

[gaozhangfei]

could you send a patch? using #ifdef just like --enable-kae?
not familiar about GmSSL-v2+, and setup readme.