FAPI: Fix file io if d_type of dirent is not supported. #793

Job	Run time
scanbuild	6m 43s
test-coverage	4m 52s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 33s
test-fuzz	2m 32s
build-test (ubuntu-20.04, clang)	4m 21s
test-mbedtls (ubuntu-20.04)	2m 54s
build-test (fedora-32, gcc)	4m 38s
test-no-crypto-build	1m 17s
build-test (fedora-32, clang)	4m 49s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 41s
build-test (opensuse-leap, gcc)	4m 29s
test-tcti-config	14m 29s
build-test (opensuse-leap, clang)	4m 34s
build-test (ubuntu-22.04, gcc)	4m 29s
build-test (ubuntu-22.04, clang)	4m 32s
build-test (alpine-3.15, gcc)	3m 51s
build-test (alpine-3.15, clang)	4m 46s
	1h 20m 30s

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