rustbuild: detect cxx for all targets
Replaces #61544
Fixes #59917
We need CXX to build llvm-libunwind which can be enabled for all
targets.
As we needed it for all hosts anyways, just move the detection so that
it is ran for all targets (which contains all hosts) instead.
Signed-off-by: NMarc-Antoine Perennou <Marc-Antoine@Perennou.com>
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