tests: use raw string in test-impexp-branch.t On first glance, the escaping of \s seems correct. However, the shell eats the escape and we're left with '\s` in the written file. Let's use a raw string so we don't have to double escape. Differential Revision: https://phab.mercurial-scm.org/D5973

#include <Python.h>

namespace contrib
{

void initpy(const char *cselfpath);
PyObject *pyglobals();

} /* namespace contrib */