Add a cfg evaluator for the non-Cargo builds #1001
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Conditional compilation support for non-Cargo builds (part of #989). This is the non-Cargo followup to #1000. The C++ code generator evaluates
#[cfg(...)]attributes by taking flags equivalent torustc's--cfgflag:$ cxxbridge --cfg 'unix' --cfg 'target_arch="x86_64"' --cfg 'target_endian="little"' --cfg 'test=false' …