Test

Add RegisterFunc on unsupported platforms #760

Job	Run time
Test with Go 1.18.10 on FreeBSD	3m 44s
Test with Go 1.18.x on ubuntu-latest	1m 59s
Test with Go 1.19.13 on FreeBSD	3m 35s
Test with Go 1.19.x on ubuntu-latest	2m 18s
Test with Go 1.20.14 on FreeBSD	4m 8s
Test with Go 1.20.x on ubuntu-latest	2m 16s
Test with Go 1.21.7 on FreeBSD	4m 3s
Test with Go 1.21.x on ubuntu-latest	2m 13s
Test with Go 1.22.0 on FreeBSD	4m 5s
Test with Go 1.22.x on ubuntu-latest	2m 17s
Test with Go 1.18.x on macos-latest	54s
Test with Go 1.19.x on macos-latest	52s
Test with Go 1.20.x on macos-latest	51s
Test with Go 1.21.x on macos-latest	1m 4s
Test with Go 1.22.x on macos-latest	54s
Test with Go 1.18.x on windows-latest	1m 42s
Test with Go 1.19.x on windows-latest	2m 3s
Test with Go 1.20.x on windows-latest	2m 11s
Test with Go 1.21.x on windows-latest	2m 4s
Test with Go 1.22.x on windows-latest	2m 6s
	45m 19s

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