FAPI: Fix usage of external PEM keys for PolicyAuthorize. 4.0.x #736

Job	Run time
scanbuild	6m 36s
test-mbedtls (ubuntu-20.04)	3m 1s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 40s
test-coverage	6m 3s
build-test (ubuntu-20.04, gcc)	4m 56s
test-no-crypto-build	1m 20s
build-test (ubuntu-20.04, clang)	4m 31s
test-fuzz	2m 20s
test-tcti-config	12m 43s
build-test (fedora-32, gcc)	5m 18s
build-test (fedora-32, clang)	5m 13s
coverity-test	0s
build-test (opensuse-leap, gcc)	4m 57s
build-test (opensuse-leap, clang)	4m 50s
build-test (ubuntu-22.04, gcc)	5m 30s
build-test (ubuntu-22.04, clang)	5m 39s
build-test (alpine-3.15, gcc)	4m 5s
build-test (alpine-3.15, clang)	5m 7s
	1h 24m 49s

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