Use local proxy instead of scala.tools.cmd patch

Copied the `CompilerAPICompat` code verbatim from @WojciechMazur's
suggestion on bazel-contrib#1634. Definitely seems more robust than injecting
`CommandLineParser` directly into `scala.tools.cmd`.

Author: mbland

third_party/utils/src/test/BUILD

@@ -13,8 +13,11 @@ scala_library(
         any_3 = [
             "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
         ],
+        before_2_13_9 = [
+            "io/bazel/rulesscala/utils/CompilerAPICompat_before_2_13_9.scala",
+        ],
         between_2_13_9_and_3 = [
-            "scala/tools/cmd/Scala_2_13_9_CommandLineParser.scala",
+            "io/bazel/rulesscala/utils/CompilerAPICompat_since_2_13_9.scala",
         ],
     ),
     visibility = ["//visibility:public"],

third_party/utils/src/test/io/bazel/rulesscala/utils/CompilerAPICompat_before_2_13_9.scala

@@ -0,0 +1,7 @@
+package io.bazel.rulesscala.utils
+
+import scala.tools.cmd.CommandLineParser
+
+trait CompilerAPICompat {
+  def tokenize(cmd: String): List[String] = CommandLineParser.tokenize(cmd)
+}

third_party/utils/src/test/io/bazel/rulesscala/utils/CompilerAPICompat_since_2_13_9.scala

@@ -0,0 +1,14 @@
+package scala {
+  package rulesscala {
+    // proxy to private[scala] compiler API
+    object Proxy {
+      def tokenize(cmd: String): List[String] = sys.process.Parser.tokenize(cmd)
+    }
+  }
+}
+
+package io.bazel.rulesscala.utils {
+  trait CompilerAPICompat {
+    def tokenize(cmd: String): List[String] = scala.rulesscala.Proxy.tokenize(cmd)
+  }
+}

third_party/utils/src/test/io/bazel/rulesscala/utils/TestUtil.scala

@@ -7,14 +7,13 @@ import scala.reflect.io.AbstractFile
 import scala.reflect.io.Directory
 import scala.reflect.io.PlainDirectory
 import scala.reflect.io.VirtualDirectory
-import scala.tools.cmd.CommandLineParser
 import scala.tools.nsc.CompilerCommand
 import scala.tools.nsc.Global
 import scala.tools.nsc.Settings
 import scala.tools.nsc.reporters.StoreReporter
 import io.bazel.rulesscala.dependencyanalyzer.DependencyTrackingMethod
 
-object TestUtil {
+object TestUtil extends CompilerAPICompat {
   final val defaultTarget = "//..."
 
   val isWindows: Boolean = System.getProperty("os.name").toLowerCase.contains("windows")
@@ -116,7 +115,7 @@ object TestUtil {
     output: AbstractFile
   ): List[StoreReporter#Info] = {
     // TODO: Optimize and cache global.
-    val options = CommandLineParser.tokenize(compileOptions)
+    val options = tokenize(compileOptions)
     val reporter = new StoreReporter()
     val settings = new Settings(println)
     val _ = new CompilerCommand(options, settings)