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lib: use indexed appends for dependent signals #15654

Job	Run time
Build slim tarball	56s
aarch64-linux: Cache V8 build	28s
x86_64-darwin: with shared libraries / build	49m 13s
x86_64-linux: with shared libraries and perfetto / build	29m 47s
aarch64-darwin: with shared libraries / build	30m 33s
aarch64-linux: with shared boringssl-0.20261020.0 / build	21m 3s
aarch64-linux: with shared openssl-3.0.22 / build	23m 19s
aarch64-linux: with shared openssl-fips-3.5.9 / build	26m 30s
aarch64-linux: with shared openssl-4.1.0 / build	21m 26s
aarch64-linux: with shared openssl-3.5.9 / build	22m 16s
	3h 45m 31s