Add additional EVP_SKEY helpers #482

Job	Run time
compiler (gcc-7, ubuntu-20.04)	43s
compiler (gcc-8, ubuntu-20.04)	49s
compiler (gcc-9, ubuntu-20.04)	40s
compiler (gcc-10, ubuntu-20.04)	38s
compiler (gcc-11, ubuntu-22.04)	45s
compiler (gcc-12, ubuntu-22.04)	53s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	5m 16s
compiler (clang-6.0, ubuntu-20.04)	59s
compiler (clang-7, ubuntu-20.04)	51s
compiler (clang-8, ubuntu-20.04)	59s
compiler (clang-9, ubuntu-20.04)	55s
compiler (clang-10, ubuntu-20.04)	48s
compiler (clang-11, ubuntu-20.04)	49s
compiler (clang-12, ubuntu-20.04)	49s
compiler (clang-13, ubuntu-22.04)	59s
compiler (clang-14, ubuntu-22.04)	52s
compiler (clang-15, ubuntu-22.04, jammy)	51s
compiler (clang-16, ubuntu-22.04, jammy)	1m 3s
compiler (clang-17, ubuntu-22.04, jammy)	57s
	20m 36s

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