[Bug 50405] Missing ability to read Evironment Block and Environment Block Size from any Process ID kernel32

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50405

--- Comment #5 from Zebediah Figura  ---
This bug actually does seem to be valid. According to [1], we're missing the
following fields of RTL_USER_PROCESS_PARAMETERS:

ULONG EnvironmentSize;
    ULONG EnvironmentVersion;
    PVOID PackageDependencyData;
    ULONG ProcessGroupId;
    ULONG LoaderThreads;

[1] https://processhacker.sourceforge.io/doc/ntrtl_8h_source.html

I'm not sure what the point of EnvironmentSize is, since the environment is
doubly null-terminated, but there you go...