Fix #9024: Don't publish empty compat jars

Author: anatoliykmetyuk

project/Build.scala

@@ -1110,20 +1110,26 @@ object Build {
       // depend on it via scala3-library, because sbt may rewrite dependencies
       // (see https://github.com/sbt/sbt/pull/2634), but won't rewrite the direct
       // dependencies of scala-library (see https://github.com/sbt/sbt/pull/2897)
-      libraryDependencies += "org.scala-lang" % "scala-library" % stdlibVersion(Bootstrapped)
+      libraryDependencies += "org.scala-lang" % "scala-library" % stdlibVersion(Bootstrapped),
+      publish / skip := true
     )
 
   lazy val `scala-compiler` = project.
-    settings(commonDummySettings)
+    settings(commonDummySettings).
+    settings(
+      publish / skip := true
+    )
   lazy val `scala-reflect` = project.
     settings(commonDummySettings).
     settings(
-      libraryDependencies := Seq("org.scala-lang" % "scala-reflect" % stdlibVersion(Bootstrapped))
+      libraryDependencies := Seq("org.scala-lang" % "scala-reflect" % stdlibVersion(Bootstrapped)),
+      publish / skip := true
     )
   lazy val scalap = project.
     settings(commonDummySettings).
     settings(
-      libraryDependencies := Seq("org.scala-lang" % "scalap" % stdlibVersion(Bootstrapped))
+      libraryDependencies := Seq("org.scala-lang" % "scalap" % stdlibVersion(Bootstrapped)),
+      publish / skip := true
     )
 
 
@@ -1382,9 +1388,9 @@ object Build {
         // non-bootstrapped compiler), so publish the bootstrapped one by
         // default.
         addCommandAlias("publishLocal", "scala3-bootstrapped/publishLocal"),
-      )
-      .settings(
-        publishArtifact := false
+      ).
+      settings(
+        publish / skip := true
       )
 
     def asDottyCompiler(implicit mode: Mode): Project = project.withCommonSettings.