Fix GHCJS BuildRunner test on Windows

cabal-testsuite/PackageTests/GHCJS/BuildRunner/cabal.test.hs

 import Test.Cabal.Prelude
 
 main = do
-  cabalTest . expectBrokenIfWindows 10179 . recordMode DoNotRecord $ do
+  cabalTest . recordMode DoNotRecord $ do
     cwd <- fmap testCurrentDir getTestEnv
     testInvokedWithBuildRunner cwd "test" []
     testInvokedWithBuildRunner cwd "run" ["ghcjs-exe"]
@@ -14,6 +14,8 @@ testInvokedWithBuildRunner cwd cabalCmd extraArgs = do
         [ "--ghcjs"
         , "--with-compiler", cwd </> fakeGhcjsPath
         ]
+        -- On windows point cabal to the right cc
+        ++ if isWindows then ["--with-gcc", "scripts/cc.bat"] else []
     assertOutputContains magicString output
   where
-    fakeGhcjsPath = "scripts/fake-ghcjs.sh"
+    fakeGhcjsPath = if isWindows then "scripts/fake-ghcjs.exe" else "scripts/fake-ghcjs.sh"

cabal-testsuite/PackageTests/GHCJS/BuildRunner/scripts/cc.bat

+@ECHO off
+
+FOR /f "delims=" %%A in ('call ghc.exe --print-libdir') do set "libdir=%%A"
+FOR /f "delims=" %%A in ('call ghc.exe --numeric-version') do set "numVersion=%%A"
+setlocal EnableDelayedExpansion
+
+call :compareVersions 9.4.1 %numVersion%
+if %errorlevel% == 1 (set "cc=gcc.exe") else (set "cc=clang.exe")
+CALL !libdir:lib=mingw\bin\!%cc% %*
+EXIT /B %ERRORLEVEL%
+
+REM taken from https://stackoverflow.com/questions/15807762/compare-version-numbers-in-batch-file
+
+:compareVersions  version1  version2
+::
+:: Compares two version numbers and returns the result in the ERRORLEVEL
+::
+:: Returns 1 if version1 > version2
+::         0 if version1 = version2
+::        -1 if version1 < version2
+::
+:: The nodes must be delimited by . or , or -
+::
+:: Nodes are normally strictly numeric, without a 0 prefix. A letter suffix
+:: is treated as a separate node
+::
+setlocal enableDelayedExpansion
+set "v1=%~1"
+set "v2=%~2"
+:loop
+call :parseNode "%v1%" n1 v1
+call :parseNode "%v2%" n2 v2
+if %n1% gtr %n2% exit /b 1
+if %n1% lss %n2% exit /b -1
+if not defined v1 if not defined v2 exit /b 0
+if not defined v1 exit /b -1
+if not defined v2 exit /b 1
+goto :loop
+
+
+:parseNode  version  nodeVar  remainderVar
+for /f "tokens=1* delims=." %%A in ("%~1") do (
+  set "%~2=%%A"
+  set "%~3=%%B"
+)

cabal-testsuite/PackageTests/GHCJS/BuildRunner/scripts/fake-ghcjs.shim

+path = "sh.exe"
+args = "scripts/fake-ghcjs.sh"

cabal-testsuite/PackageTests/GHCJS/BuildRunner/scripts/ghcjs-pkg.shim

+path = "sh.exe"
+args = "scripts/ghcjs-pkg"