Add --enable-ipv6 (#47) #99

Job	Run time
(MacOS x86_64) Build curl-impersonate and run the tests	15m 18s
(MacOS x86_64) Build curl-impersonate and run the tests	6m 47s
(Linux x86_64) Build curl-impersonate and run the tests	13m 0s
(Linux x86_64) Build curl-impersonate and run the tests	13m 0s
(MacOS arm64) Build curl-impersonate and run the tests	7m 9s
(MacOS arm64) Build curl-impersonate and run the tests	7m 9s
(Linux i386) Build curl-impersonate and run the tests	7m 51s
(Linux i386) Build curl-impersonate and run the tests	7m 51s
(Linux aarch64) Build curl-impersonate and run the tests	8m 16s
(Linux aarch64) Build curl-impersonate and run the tests	8m 16s
(Linux arm) Build curl-impersonate and run the tests	8m 21s
(Linux arm) Build curl-impersonate and run the tests	8m 21s
	1h 51m 19s

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