Test

Add RegisterFunc on unsupported platforms #758

Job	Run time
Test with Go 1.18.10 on FreeBSD	3m 32s
Test with Go 1.19.13 on FreeBSD	3m 31s
Test with Go 1.18.x on ubuntu-latest	1m 51s
Test with Go 1.20.14 on FreeBSD	3m 53s
Test with Go 1.19.x on ubuntu-latest	2m 4s
Test with Go 1.21.7 on FreeBSD	3m 46s
Test with Go 1.20.x on ubuntu-latest	1m 57s
Test with Go 1.22.0 on FreeBSD	3m 49s
Test with Go 1.21.x on ubuntu-latest	1m 52s
Test with Go 1.22.x on ubuntu-latest	1m 52s
Test with Go 1.18.x on macos-latest	52s
Test with Go 1.19.x on macos-latest	59s
Test with Go 1.20.x on macos-latest	54s
Test with Go 1.21.x on macos-latest	53s
Test with Go 1.22.x on macos-latest	1m 0s
Test with Go 1.18.x on windows-latest	1m 46s
Test with Go 1.19.x on windows-latest	1m 56s
Test with Go 1.20.x on windows-latest	2m 0s
Test with Go 1.21.x on windows-latest	1m 57s
Test with Go 1.22.x on windows-latest	2m 0s
	42m 24s

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