FFI: Workaround for platform dlerror() returning NULL. #2105

Job	Run time
LuaJIT (Linux/ARM64) Debug GC64:ON CC:gcc	3m 2s
LuaJIT (macOS/ARM64) Debug GC64:ON CC:clang	23s
LuaJIT (Linux/ARM64) Release GC64:ON CC:gcc	2m 3s
LuaJIT (macOS/ARM64) Release GC64:ON CC:clang	31s
LuaJIT (Linux/x86_64) Debug GC64:ON CC:gcc	3m 21s
LuaJIT (Linux/x86_64) Debug GC64:ON CC:clang	2m 8s
LuaJIT (macOS/x86_64) Debug GC64:ON CC:clang	31s
LuaJIT (Linux/x86_64) Debug GC64:OFF CC:gcc	37s
LuaJIT (Linux/x86_64) Debug GC64:OFF CC:clang	39s
LuaJIT (Linux/x86_64) Release GC64:ON CC:gcc	2m 28s
LuaJIT (Linux/x86_64) Release GC64:ON CC:clang	2m 22s
LuaJIT (macOS/x86_64) Release GC64:ON CC:clang	49s
LuaJIT (Linux/x86_64) Release GC64:OFF CC:gcc	34s
LuaJIT (Linux/x86_64) Release GC64:OFF CC:clang	38s
Tarantool (Linux/ARM64) Debug GC64:ON / luajit-integration	2m 18s
Tarantool (macOS/ARM64) Debug GC64:ON / luajit-integration	1m 46s
Tarantool (Linux/ARM64) Release GC64:ON / luajit-integration	3m 10s
Tarantool (macOS/ARM64) Release GC64:ON / luajit-integration	2m 9s
Tarantool (Linux/x86_64) Debug GC64:OFF / luajit-integration	1m 45s
Tarantool (Linux/x86_64) Debug GC64:ON / luajit-integration	2m 29s
Tarantool (macOS/x86_64) Debug GC64:ON / luajit-integration	2m 3s
Tarantool (Linux/x86_64) Release GC64:OFF / luajit-integration	2m 20s
Tarantool (Linux/x86_64) Release GC64:ON / luajit-integration	2m 18s
Tarantool (macOS/x86_64) Release GC64:ON / luajit-integration	2m 23s
	42m 47s

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