added lib/debugsup/debugsup-ntos.def
added lib/debugsup/debugsup.rbuild
modified lib/lib.rbuild
New import-only library. Links modules that need low-level debugging functions (DbgBreakPoint, DbgBreakPointWithStatus, DbgPrint, DbgPrompt, DbgPrintEx, RtlAssert, RtlUnwind) to the correct low-level library (ntdll for user mode and ntoskrnl for kernel mode). This ensures debugging macros will always work, everywhere, and it doesn't force all modules with debugging information to link to ntdll/ntoskrnl. TODO: link RtlUnwind to kernel32 for Win32 modules
modified tools/rbuild/backend/mingw/modulehandler.cpp
modified tools/rbuild/backend/mingw/modulehandler.h
Add debugsup_ntdll/debugsup_ntoskrnl as an implicit library for all executable modules (minus the kernel)
svn path=/trunk/; revision=26051
