BUG: cfuncs.py: fix crash when sys.stderr is not available #27021
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In some environments (for example frozen executables created with PyInstaller for GUI applications) `sys.stderr` and `sys.stdout` might be `None`. The import-time access to `sys.stderr.write` in some `f2py` modules was causing such applications to crash during startup. Fix numpy#26862
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Backport of #27013.
In some environments (for example frozen executables created with PyInstaller for GUI applications)
sys.stderrandsys.stdoutmight beNone.The import-time access to
sys.stderr.writein somef2pymodules was causing such applications to crash during startup.Fix #26862