add custom equivalence functions #5674

Job	Run time
android_ndk_lts (aarch64-linux-android)	1m 33s
android_ndk_lts (armv7-linux-androideabi)	48s
docker	1m 36s
http3_test	48s
android_ndk_lts (x86_64-linux-android)	1m 4s
nginx (1.16.1)	51s
android_ndk_lts (i686-linux-android)	1m 13s
quiche	3m 11s
quiche_ios (x86_64-apple-ios)	1m 7s
quiche (boringssl-boring-crate)	3m 28s
quiche_macos (macos-13)	4m 29s
quiche_ios (aarch64-apple-ios)	1m 11s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 0s
quiche (openssl)	3m 17s
quiche_macos (macos-latest)	2m 2s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 20s
quiche_multiarch (i686-unknown-linux-gnu)	1m 49s
quiche_windows (x86_64-pc-windows-msvc)	3m 43s
quiche_windows (i686-pc-windows-msvc)	3m 26s
quiche_windows (x86_64-pc-windows-gnu)	7m 26s
quiche_windows (i686-pc-windows-gnu)	5m 24s
	54m 46s

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