Don't strip libraries on Windows

Stripping triggers a bug in strip.exe when there are lots of
identically named modules. The strip program has a limit in how it
generates temp file names, which eventually leads to name collision.

Fixes #1784.

Cabal/Distribution/Simple/Program/Strip.hs

@@ -49,6 +49,10 @@ stripLib verbosity (Platform _arch os) conf path = do
            return ()
     IOS -> return ()
     Solaris -> return ()
+    Windows -> -- Stripping triggers a bug in 'strip.exe' for
+               -- libraries with lots identically named modules. See
+               -- #1784.
+               return()
     _   -> runStrip verbosity conf path args
   where
     args = ["--strip-unneeded"]