FAPI: Fix usage of external PEM keys for PolicyAuthorize. #726

Job	Run time
test-coverage	5m 34s
build-test (ubuntu-20.04, gcc)	4m 40s
coverity-test	0s
scanbuild	6m 47s
build-test (ubuntu-20.04, clang)	4m 31s
test-fuzz	2m 40s
build-test (fedora-32, gcc)	4m 38s
build-test (fedora-32, clang)	4m 56s
test-mbedtls (ubuntu-20.04)	3m 1s
test-no-crypto-build	1m 31s
build-test (opensuse-leap, gcc)	4m 30s
test-tcti-config	14m 10s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 44s
build-test (opensuse-leap, clang)	4m 45s
build-test (ubuntu-22.04, gcc)	4m 41s
build-test (ubuntu-22.04, clang)	4m 42s
build-test (alpine-3.15, gcc)	3m 54s
build-test (alpine-3.15, clang)	4m 54s
	1h 22m 38s

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