Allow bootstrapping stdlib from source #548

Job	Run time
Test test with Bazel 9.x on windows-11-arm	8m 25s
Test test with Bazel 9.x on windows-latest	9m 13s
Test test with Bazel 9.x on ubuntu-latest	5m 42s
Test test with Bazel 8.x on ubuntu-latest	21m 26s
Test test with Bazel 8.x on ubuntu-24.04-arm	21m 23s
Test . with Bazel 9.x on ubuntu-24.04-arm	19s
Test . with Bazel 9.x on ubuntu-latest	17s
Test . with Bazel 8.x on ubuntu-24.04-arm	20s
Test . with Bazel 8.x on ubuntu-latest	18s
Test test with Bazel 9.x on ubuntu-24.04-arm	5m 2s
	1h 12m 25s

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