Error on build posixmodule.c in old Cygwin

[TrueCat17]

Bug report

Bug description:

Line 253 includes the file cygwin/limits.h with the comment // Needed for XATTR_SIZE_MAX and XATTR_LIST_MAX.
But this only applies to new versions of Cygwin, i.e. after June 16, 2023, as far as I understand: git-for-windows/msys2-runtime@538b29a
In previous versions, such constants are simply missing, and accordingly, errors occur during compilation

I fixed it like this:

#    include <cygwin/limits.h>  // Needed for XATTR_SIZE_MAX and XATTR_LIST_MAX.
#    ifndef XATTR_SIZE_MAX
#      define XATTR_SIZE_MAX 65536
#    endif
#    ifndef XATTR_LIST_MAX
#      define XATTR_LIST_MAX 65536
#    endif

Everything works for me, however, I have not checked the accuracy of these limits
It’s even possible, in my case, that functions that use these constants are not called at all
However, I still fixed the building for myself this way

CPython version: 3.14.4
Cygwin 3.3.6-341 (win7 32-bit)

CPython versions tested on:

3.14

Operating systems tested on:

Windows