On windows memory_maps() does not return anonymous maps

[scudette]

The code here:

psutil/psutil/_psutil_windows.c

Line 2802 in 49f8555

if (GetMappedFileNameA(hProcess, baseAddress, mappedFileName,

Skips the result if it has no filename. This skips anonymous mappings (like heap and VirtualAlloc regions). This behaviour is not consistent with psutil on linux which includes anonymous regions:

psutil/psutil/_pslinux.py

Line 1213 in 49f8555

path = '[anon]'

It would be nice to get the anonymous regions too on windows.

[giampaolo]

Would you like to provide a PR?