Reenable PkgConfigParse on Windows

cabal-testsuite/PackageTests/PkgConfigParse/pkg-config.shim

@@ -0,0 +1,2 @@
+path = "FINDSH\sh.exe"
+args = "pkg-config"

cabal-testsuite/PackageTests/PkgConfigParse/setup.test.hs

@@ -1,7 +1,17 @@
+import System.Directory
 import Test.Cabal.Prelude
 
 -- Test that invalid unicode in pkg-config output doesn't trip up cabal very much
-main = cabalTest $ expectBrokenIfWindows 10179 $ do
+main = cabalTest $ do
+  when isWindows $ do
+        sh <- fmap takeDirectory <$> liftIO (findExecutable "sh")
+        case sh of
+            Nothing -> skip "no sh"
+            Just sh' -> do
+                let sh'' = concatMap (\c -> case c of
+                            '\\' -> "\\\\\\\\"
+                            x -> [x]) sh'
+                void $ shell "sed" [ "-i", "-e", "s/FINDSH/" <> sh'' <> "/g", "pkg-config.shim"]
   cdir <- testCurrentDir `fmap` getTestEnv
   res <- cabal' "v2-build" ["--extra-prog-path="++cdir, "-v2"]
   assertOutputContains "Some pkg-config packages have names containing invalid unicode: or" res