Return NSError for invalid keyed unarchive data #2916

Job	Run time
Ubuntu x64 Clang gnustep-2.2	6m 22s
Rocky Linux 8 x64 Clang gnustep-2.2	2m 43s
Windows x64 MinGW GCC	2m 58s
Rocky Linux 9 x64 Clang gnustep-2.2	7m 15s
Windows x64 MinGW Clang gnustep-2.2	32m 11s
Ubuntu x64 GCC	1m 0s
Windows x64 MSVC Clang gnustep-2.2	26m 6s
Windows arm64 MSVC Clang gnustep-2.2	41m 59s
	2h 0m 34s

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