Enable build on FreeBSD #40

Job	Run time
Ruby with gcc compiler on alpine:3.18	3m 10s
Ruby with clang compiler on alpine:3.18	3m 8s
test (ubuntu, 2.5)	2m 44s
Ruby with gcc compiler on alpine:3.16	3m 38s
test (ubuntu, 2.6)	3m 5s
Ruby with clang compiler on alpine:3.16	3m 50s
test (ubuntu, 2.7)	2m 57s
test (ubuntu, 3.0)	2m 37s
test (ubuntu, 3.1)	2m 30s
test (ubuntu, 3.2)	2m 37s
test (ubuntu, head)	2m 37s
test (macos, 2.5)	6s
test (macos, 2.6)	1m 48s
test (macos, 2.7)	1m 54s
test (macos, 3.0)	1m 34s
test (macos, 3.1)	1m 20s
test (macos, 3.2)	1m 18s
test (macos, head)	1m 21s
test (windows, 2.5)	4m 16s
test (windows, 2.6)	4m 25s
test (windows, 2.7)	2m 28s
test (windows, 3.0)	1m 43s
test (windows, 3.1)	1m 24s
test (windows, 3.2)	1m 47s
test (windows, head)	1m 36s
Release gem	0s
	59m 53s

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