[cython/cython] [BUG] Invalid C code from simple parallel example (Issue #6203)

[da-woods]

Describe the bug

Follow following generates the C error:

error: expected identifier before ‘)’ token
 2442 |             #pragma omp parallel private() firstprivate(__pyx_t_1) private(__pyx_filename, __pyx_lineno, __pyx_clineno) shared(__pyx_parallel_why, __pyx_parallel_exc_type, __pyx_parallel_exc_value, __pyx_parallel_exc_tb)`

Specifically the issue is private(). I think we just need to skip generating it when there's an empty list.

Code to reproduce the behaviour:

from cython.parallel import parallel

def parallelxxx():
    with nogil, parallel():
        with gil:
            s = object()

Expected behaviour

Compilation

OS

Linux

Python version

No response

Cython version

current master

Additional context

No response

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