Provide an option for the base/rom extension that causes the toolchain id (ARMCC or GCCE) to be defined for the C preprocessor phase of rombuild, enabling rom files to be conditionally included or excluded depending on whether the toolchain can build them. This mimics the same change for Beagleboard.

#ifndef Py_AST_H
#define Py_AST_H
#ifdef __cplusplus
extern "C" {
#endif

PyAPI_FUNC(mod_ty) PyAST_FromNode(const node *, PyCompilerFlags *flags,
				  const char *, PyArena *);

#ifdef __cplusplus
}
#endif
#endif /* !Py_AST_H */