Fix Windows build to work with ghc 7.10

It was failing at link time, some problem with terminatePID.
Re-implemented that to not use a C wrapper function, which cleared up the
problem. Removed old EvilLinker hack with must have been related to the
same problem.

Note that I have not tested this with older ghc's. In
f11f7520b5 I mention having tried this
approach before, and getting segfaults.. So, who knows. It seems to work
fine with ghc 7.10 at least.

Build/EvilLinker.hs

@@ -95,19 +95,13 @@ parseCollect2 = do
 	path <- manyTill anyChar (try $ string ldcmd)
 	void $ char ' '
 	params <- restOfLine
-	return $ CmdParams (path ++ ldcmd) (skipHack $ escapeDosPaths params) Nothing
+	return $ CmdParams (path ++ ldcmd) (escapeDosPaths params) Nothing
   where
 	ldcmd = "ld.exe"
 	versionline = do
 		void $ string "collect2 version"
 		restOfLine
 
-{- For unknown reasons, asking the linker to link this in fails,
- - with error about multiple definitions of a symbol from the library.
- - This is a horrible hack. -}
-skipHack :: String -> String
-skipHack = replace "dist/build/git-annex/git-annex-tmp/Utility/winprocess.o" ""
-
 {- Input contains something like 
  - c:/program files/haskell platform/foo -LC:/Program Files/Haskell Platform/ -L...
  - and the *right* spaces must be escaped with \