FAPI: Enable importing of private OSSL keys. #540

Job	Run time
coverity-test	0s
scanbuild	6m 32s
test-coverage	5m 7s
build-test (ubuntu-18.04, gcc)	4m 47s
build-test (ubuntu-18.04, clang)	5m 5s
test-fuzz	2m 34s
test-mbedtls (ubuntu-20.04)	2m 58s
build-test (ubuntu-20.04, gcc)	5m 6s
test-no-crypto-build	1m 27s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 54s
build-test (ubuntu-20.04, clang)	4m 45s
test-tcti-config	13m 55s
build-test (fedora-32, gcc)	5m 4s
build-test (fedora-32, clang)	5m 5s
build-test (opensuse-leap, gcc)	4m 54s
build-test (opensuse-leap, clang)	4m 46s
build-test (ubuntu-22.04, gcc)	5m 9s
build-test (ubuntu-22.04, clang)	5m 5s
build-test (alpine-3.15, gcc)	4m 16s
build-test (alpine-3.15, clang)	5m 5s
	1h 34m 34s

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