Revert "[runtimes] Always define cxx_shared, cxx_static & other targets"

This reverts commit 79ee0342dbf025bc70f237bdfe9ccb4e10a592ce which
breaks the LLVM TSan bots.

NOKEYCHECK=True
GitOrigin-RevId: a3539090884c9159893c0b2b4c1dc34f23510707
1 file changed