Revert "CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE (#88835)"

This reverts commit 16f188761da1df6ba5e6627b8742aacfec8e9ec5.

This broke Libcxx Picolib testing at the install step, and builds
for Windows builtins. Revert while we figure out the cause.

GitOrigin-RevId: 3da065896b1b59fd8291958e8d13f4a942d51214
1 file changed