cc-wrapper: keep local cflags if the same target is passed

12b0e8a/6f756b4 work around clang errors when a
nix-wrapped compiler is used like a multi-target compiler.
it does so by dropping the machineFlags whenever
-target/--target is found in the arguments.

however this breaks compiler-rt, which is designed to
acommodate multi-target builds and always passes `--target`.
in its packaging we make sure to only build it for the target
we need, essentially disabling the multi-target aspect,
but because it still passes --target, the machineFlags are
dropped and compiler-rt could end up being for an invalid
ABI, producing an unusable stdenv.cc.

we could manually pass machineFlags to compiler-rt's
cmake build, but IMO it makes more sense to tolerate
--target arguments whose value coincides with the wrapper's,
keeping the machineFlags in this case.

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