added implementation of the openssl_x509_verify function (#917) #255

Job	Run time
jammy/g++/c++17/asan=off/ubsan=off	12m 38s
focal/clang++/c++17/asan=off/ubsan=on	12m 9s
focal/g++-10/c++20/asan=on/ubsan=off	14m 29s
	39m 16s

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