Patch by Stephen Tonkin.

Patch by Stephen Tonkin.

Calling OS functions can fail with errors other than FileNotFoundError: a
FreeBSD buildbot fails for example with a PermissionError.

... (unsigned long and unsigned int) to avoid an undefined behaviour with
Py_TPFLAGS_TYPE_SUBCLASS ((1 << 31). PyType_GetFlags() result type is now
unsigned too (unsigned long, instead of long).

Patch written by Serhiy Storchaka.

Pass the original filename argument to OSError constructor, instead of trying
to encode it to or decode it from the filesystem encoding. This change avoids
an additionnal UnicodeDecodeError on Windows if the filename cannot be decoded
from the filesystem encoding (ANSI code page).

Patch written by Serhiy Storchaka.

Patch by Zachary Ware.

Patch by Matti Mäki.

Patch by Matti Mäki.

Patch by Matti Mäki.

don't ignore it if it's still there.

Patch by Serhiy Storchaka.