Remove pre-cxx-abi mention for libtorch builds #1197

Job	Run time
macos-arm64-nightly-matrix / generate	4s
linux-nightly-matrix / generate	5s
windows-nightly-matrix / generate	4s
macos-arm64-release-matrix / generate	7s
linux-release-matrix / generate	3s
windows-release-matrix / generate	7s
update-quick-start	1s
	31s

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