OpenSSL/fallback.pm: add limited support for being called from inner … #894

Job	Run time
compiler (gcc-7, ubuntu-20.04)	7m 48s
compiler (gcc-8, ubuntu-20.04)	6m 8s
compiler (gcc-9, ubuntu-20.04)	7m 55s
compiler (gcc-10, ubuntu-20.04)	6m 13s
compiler (gcc-11, ubuntu-22.04)	7m 41s
compiler (gcc-12, ubuntu-22.04)	7m 47s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	7m 5s
compiler (clang-6.0, ubuntu-20.04)	2m 20s
compiler (clang-7, ubuntu-20.04)	1m 52s
compiler (clang-8, ubuntu-20.04)	2m 44s
compiler (clang-9, ubuntu-20.04)	6m 38s
compiler (clang-10, ubuntu-20.04)	6m 23s
compiler (clang-11, ubuntu-20.04)	6m 15s
compiler (clang-12, ubuntu-20.04)	6m 25s
compiler (clang-13, ubuntu-22.04)	8m 22s
compiler (clang-14, ubuntu-22.04)	6m 40s
compiler (clang-15, ubuntu-22.04, jammy)	6m 47s
compiler (clang-16, ubuntu-22.04, jammy)	6m 44s
	1h 51m 47s

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