[CORE-11291] Create Windows 7 spec files for core DLLs

[Love Nystrom]

@Timo,

I uploaded an ntdll.spec for Win7SP1.
Unfortunately, ntdll.pdb only exports 'SymTagPublicSymbol', no 
'SymTagFunction' symbols, so it's not possible to generate the parameter 
lists. If they're needed they'll have to be inserted manually or I'll 
have to write a tool that gets them from "wInternl.h" :/

++ At least I was able to resolve the names of the 8 ordinal functions.

I won't go into all the skull dredging details of getting thus far..
Suffice to say it involved uttering various sulphur reeking curses in 
nine different languages and threatening the entire human race with 
extinction, writing a dummy program and running it in WinDbg to make 
SymSrv fetch ntdll.pdb, and hacking CreateSpec beyond recognition with 
various hardcoded path names.

Best Regards
// Neo