Re-add FreeBSD support (broken since c1a64c1) #131

Job	Run time
test (ubuntu-20.04, 5.1)	19s
test (ubuntu-20.04, 5.2)	19s
test (ubuntu-20.04, 5.3)	18s
test (ubuntu-20.04, 5.4)	19s
test (ubuntu-20.04, luajit)	20s
test (ubuntu-20.04, luajit-openresty)	19s
test (macos-13, 5.1)	46s
test (macos-13, 5.2)	45s
test (macos-13, 5.3)	47s
test (macos-13, 5.4)	45s
test (macos-13, luajit)	45s
test (macos-13, luajit-openresty)	44s
test (macos-latest, 5.4)	33s
test (windows-latest, 5.1, msvc)	1m 16s
test (windows-latest, 5.2, msvc)	1m 11s
test (windows-latest, 5.3, msvc)	1m 18s
test (windows-latest, 5.4, msvc)	1m 16s
test (windows-latest, luajit, mingw)	1m 8s
	13m 8s

Provide feedback