swift: Pass C base compile options to swiftc #14296
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If the C/Obj-C source code needs a particular standard version, swiftc should know about it so it can parse imported headers correctly.
(This makes more sense with C++ support (commit 2xsaiko@push-nmuxysxxokuy), since setting the standard version is more common there, and was pulled out of #14261, but still applies for C as well)