[cxx-interop] Build the C++ stdlib overlay when SWIFT_BUILD_SDK_OVERLAY=NO
#63865
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The C++ stdlib overlay binaries (
libswiftCxx
andlibswiftCxxStdlib
) are now a part of the toolchain, not the OS SDKs. This makes sure that these binaries are built when building the toolchain separately from the stdlib.rdar://105799283