[2.0.x] fix: Fixes compilerPlugin(...) to ignore platform (#9135) (#9136)

**Problem**
When using scala-native, we can't enable semanticdb etc
because of the platform-level platform.

**Solution**
Since compilerPlugin(...) is always going to be JVM,
just add an explicit JVM platform to the given ModuleID.

main/src/main/scala/sbt/Defaults.scala

@@ -4813,8 +4813,8 @@ trait BuildExtra extends BuildCommon with DefExtra {
     }
 
   /** Transforms `dependency` to be in the auto-compiler plugin configuration. */
-  def compilerPlugin(dependency: ModuleID): ModuleID = {
-    dependency.configurations match {
+  def compilerPlugin(dependency: ModuleID): ModuleID =
+    dependency.configurations match
       case Some(confs) if confs.toLowerCase != "compile" && confs.nonEmpty =>
         sys.error(
           s"""Configuration-scoped compiler plugins are not supported.
@@ -4823,9 +4823,10 @@ trait BuildExtra extends BuildCommon with DefExtra {
              |The plugin will be applied to all configurations.""".stripMargin
         )
       case _ =>
-        dependency.withConfigurations(Some("plugin->default(compile)"))
-    }
-  }
+        // Compiler plugins should ignore the subproject platform and use JVM
+        dependency
+          .withConfigurations(Some("plugin->default(compile)"))
+          .platform(Platform.jvm)
 
   /** Adds `dependency` to `libraryDependencies` in the auto-compiler plugin configuration. */
   def addCompilerPlugin(dependency: ModuleID): Setting[Seq[ModuleID]] =

sbt-app/src/sbt-test/plugins/hydra/Hello.scala

@@ -1,7 +0,0 @@
-package example
-
-object Hello {
-  def main(args: Array[String]): Unit = {
-    println("Hello!")
-  }
-}

sbt-app/src/sbt-test/plugins/hydra/build.sbt

@@ -1,12 +0,0 @@
-ThisBuild / scalaVersion := "2.12.21"
-
-lazy val check = taskKey[Unit]("")
-
-lazy val root = (project in file("."))
-  .settings(
-    name := "hello",
-    check := {
-      val rs = scalaCompilerBridgeResolvers.value
-      assert(rs.exists(r => r.name == "Triplequote Maven Releases"))
-    }
-  )

sbt-app/src/sbt-test/plugins/hydra/disabled

@@ -1 +0,0 @@
-> check

sbt-app/src/sbt-test/plugins/hydra/project/HydraPlugin.scala

@@ -1,23 +0,0 @@
-package sbtmyplugin
-
-import sbt._
-import sbt.Keys._
-
-object HydraPlugin extends AutoPlugin {
-  override def requires: Plugins = plugins.JvmPlugin
-  override def trigger: PluginTrigger = allRequirements
-
-  override lazy val projectSettings = Seq(
-    resolvers += "Triplequote Maven Releases" at "https://repo.triplequote.com/artifactory/libs-release/",
-  ) ++ inConfig(Compile)(compileSettings) ++ inConfig(Test)(compileSettings)
-
-  private lazy val compileSettings: Seq[Def.Setting[_]] = inTask(compile)(compileInputsSettings)
-  
-  private def compileInputsSettings: Seq[Setting[_]] = Seq(
-    scalaCompilerBridgeSource := {
-      ModuleID("com.triplequote", "hydra-bridge_1_0", "2.1.4")
-        .withConfigurations(Some(Configurations.Compile.name))
-        .sources()
-    }
-  )
-}

sbt-app/src/sbt-test/plugins/scala-native/A.scala

@@ -0,0 +1,3 @@
+package example
+
+case class A()

sbt-app/src/sbt-test/plugins/scala-native/build.sbt

@@ -0,0 +1,3 @@
+semanticdbEnabled := true
+scalaVersion := "2.13.18"
+enablePlugins(ScalaNativePlugin)

sbt-app/src/sbt-test/plugins/scala-native/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.11")

sbt-app/src/sbt-test/plugins/scala-native/test

@@ -0,0 +1 @@
+> compile