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Run the C preprocessor on a C source file.

Specification C11

FileName preprocess(FileName csrcfile, const ref Loc loc, out bool ifile, OutBuffer* defines);
Preprocess C file.
FileName csrcfile C file to be preprocessed, with .c or .h extension
Loc loc The source location where preprocess is requested from
bool ifile set to true if an output file was written
OutBuffer* defines buffer to append any #define and #undef lines encountered to

Result filename of output