This reverts commit e27e056b45.
e27e056b45 was needed mainly for ENOTSUP.
ENOTSUP is not available in older C run-times.
Also, lib/roken has wrappers for the CRT allocator, but we don't need
those in lib/asn1 because all the functions generated by the compiler
effectively encapsulate the corresponding DLL's CRT's allocator.
This will be followed by a change to not use ENOTSUP.
92e5a4b7e5