FAPI: Enable importing of private OSSL keys. #535

Job	Run time
scanbuild	1m 27s
test-coverage	1m 26s
test-mbedtls (ubuntu-20.04)	2m 54s
test-fuzz	1m 27s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 40s
build-test (ubuntu-18.04, gcc)	47s
test-no-crypto-build	1m 18s
build-test (ubuntu-18.04, clang)	53s
test-tcti-config	1m 36s
build-test (ubuntu-20.04, gcc)	50s
build-test (ubuntu-20.04, clang)	53s
coverity-test	0s
build-test (fedora-32, gcc)	59s
build-test (fedora-32, clang)	1m 12s
build-test (opensuse-leap, gcc)	1m 9s
build-test (opensuse-leap, clang)	1m 0s
build-test (ubuntu-22.04, gcc)	44s
build-test (ubuntu-22.04, clang)	46s
build-test (alpine-3.15, gcc)	1m 17s
build-test (alpine-3.15, clang)	1m 23s
	24m 41s

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