Gracefully fail FAPI init when it's not compiled in #446

Job	Run time
fuzzing-test	4m 32s
coverage-test	7m 13s
generic-build-test (ubuntu-18.04, gcc)	7m 10s
coverity-test	0s
generic-build-test (ubuntu-18.04, clang)	6m 32s
generic-build-test (ubuntu-20.04, gcc)	7m 13s
generic-build-test (ubuntu-20.04, clang)	5m 52s
generic-build-test (fedora-30, gcc)	7m 23s
generic-build-test (fedora-30, clang)	6m 43s
generic-build-test (opensuse-leap, gcc)	7m 14s
generic-build-test (opensuse-leap, clang)	6m 20s
generic-build-test (ubuntu-22.04, gcc)	44m 32s
	1h 50m 44s

Provide feedback