Dont's pass enable-libcpp to build (host) tools when cross-compiling with libcpp

Our cross-build (i.e. the sandboxed translator build) still uses libcpp but the host
build does not.

This goes along with https://chromium-review.googlesource.com/c/native_client/src/native_client/+/2093138
to stop using libcxx in the LLVM host build

Change-Id: Ifc96c80b854e76b0482a7c538c784d12b0c9fabc
Bug: https://bugs.chromium.org/p/nativeclient/issues/detail?id=4421
Reviewed-on: https://chromium-review.googlesource.com/c/native_client/pnacl-llvm/+/2189571
Reviewed-by: Derek Schuff <dschuff@chromium.org>
1 file changed