Remove Environment.h, test-dwarf.cpp, test-dwarf.exe

from being listed as a part of the desktop or 
desktop/desktop_no_xpc Targets - they should not be
a part of any target.  Having them listed as a part of
desktop target results in them being added to the 
Copy Files build phase for desktop and I'm guessing
they'd end up in the manpage directory or something.

llvm-svn: 322237