lib: make SubtleCrypto.supports enumerable #4439

Job	Run time
Build slim tarball	39s
${{ matrix.system }}: with shared libraries	0s
Build slim tarball	2m 2s
aarch64-linux: with shared libraries	16m 39s
x86_64-darwin: with shared libraries	27m 50s
x86_64-linux: with shared libraries	19m 46s
aarch64-darwin: with shared libraries	18m 20s
	1h 25m 16s

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