Remove powershell scripts

It current leaves the shell broken after quitting Erlang.

Issues have been reported upstream, so we may be able
to bring it back in future Erlang/OTP versions.

Author: josevalim

Diff for: bin/elixir.ps1

@@ -1,13 +1,23 @@
-#!/usr/bin/env pwsh
+# Store path to mix.bat as a FileInfo object
+$mixBatPath = (Get-ChildItem (((Get-ChildItem $MyInvocation.MyCommand.Path).Directory.FullName) + '\mix.bat'))
+$newArgs = @()
 
-$scriptPath = Split-Path -Parent $PSCommandPath
-$elixirMainScript = Join-Path -Path $scriptPath -ChildPath "elixir.ps1"
+for ($i = 0; $i -lt $args.length; $i++)
+{
+  if ($args[$i] -is [array])
+  {
+    # Commas created the array so we need to reintroduce those commas
+    for ($j = 0; $j -lt $args[$i].length - 1; $j++)
+    {
+      $newArgs += ($args[$i][$j] + ',')
+    }
+    $newArgs += $args[$i][-1]
+  }
+  else
+  {
+    $newArgs += $args[$i]
+  }
+}
 
-$mixFile = Join-Path -Path $scriptPath -ChildPath "mix"
-
-$prependedArgs = @($mixFile)
-
-$allArgs = $prependedArgs + $args
-
-# The dot is going to evaluate the script with the vars defined here.
-. $elixirMainScript
+# Corrected arguments are ready to pass to batch file
+& $mixBatPath $newArgs

Diff for: bin/elixirc.ps1

@@ -64,9 +64,7 @@ end
 test_parameters =
   if(PathHelpers.windows?(),
     do: [%{cli_extension: ".bat"}],
-    else:
-      [%{cli_extension: ""}] ++
-        if(System.find_executable("pwsh"), do: [%{cli_extension: ".ps1"}], else: [])
+    else: [%{cli_extension: ""}]
   )
 
 defmodule Kernel.CLI.ExecutableTest do