Test

Add RegisterFunc on unsupported platforms #759

Job	Run time
Test with Go 1.18.10 on FreeBSD	3m 34s
Test with Go 1.19.13 on FreeBSD	3m 34s
Test with Go 1.18.x on ubuntu-latest	2m 30s
Test with Go 1.20.14 on FreeBSD	3m 52s
Test with Go 1.19.x on ubuntu-latest	2m 2s
Test with Go 1.21.7 on FreeBSD	4m 1s
Test with Go 1.20.x on ubuntu-latest	2m 34s
Test with Go 1.22.0 on FreeBSD	3m 53s
Test with Go 1.21.x on ubuntu-latest	2m 15s
Test with Go 1.22.x on ubuntu-latest	1m 57s
Test with Go 1.18.x on macos-latest	56s
Test with Go 1.19.x on macos-latest	57s
Test with Go 1.20.x on macos-latest	1m 7s
Test with Go 1.21.x on macos-latest	54s
Test with Go 1.22.x on macos-latest	56s
Test with Go 1.18.x on windows-latest	1m 47s
Test with Go 1.19.x on windows-latest	1m 51s
Test with Go 1.20.x on windows-latest	3m 8s
Test with Go 1.21.x on windows-latest	2m 48s
Test with Go 1.22.x on windows-latest	2m 49s
	47m 25s

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