The new packages do not pull this in automatically.

The updated packages fix our Start/Stop process tests, which were
failing intermittently due to the process name appearing incorrect.

See dotnet/corefx#5421 for further details.

The packages are now dependencies of the `dnxcore50` framework itself,
rather than globally. The `compilationOptions` were pruned, with
`CORECLR` moved to frameworks, `_CORECLR` removed for all but
`Management.Infrastructure`, and `LINUX` moved to a new `Linux`
configuration, used only in `build.sh`. This configuration is
purposefully absent from libraries that do not use `LINUX`, so that it
is not relied upon without strong consideration. The dependencies
were pruned to reduce duplication.

For the Windows console.

To enable building on both Core and Full CLR with the same project.json
files, the superset of file dependencies for both builds must be
included. The set differences are applied by `CORECLR` preprocessor
guards around the files themselves.

The file name cases were corrected for case-sensitive filesystems.

This script builds PowerShell targeting FullCLR, using the same projects
as Core PowerShell, and PowerShell on Linux.