merge util-interface back into compiler-interface

When I split zinc and util, I needed to create util-interface because some Java classes are used by util-logging. Now that these are out of zinc, we can unite them again into a single subproject.

Author: eed3si9n

build.sbt

@@ -24,7 +24,7 @@ def commonSettings: Seq[Setting[_]] = Seq(
 )
 
 lazy val compilerInterfaceRoot = (project in file("."))
-  .aggregate(compilerInterface, utilInterface)
+  .aggregate(compilerInterface)
   .settings(
     publish / skip := true,
     crossScalaVersions := Vector(),
@@ -51,7 +51,6 @@ lazy val compilerInterfaceRoot = (project in file("."))
 //   format from which Java sources are generated by the sbt-contraband plugin.
 lazy val compilerInterface = (project in file("compiler-interface"))
   .enablePlugins(ContrabandPlugin)
-  .dependsOn(utilInterface)
   .settings(
     commonSettings,
     name := "Compiler Interface",
@@ -92,20 +91,6 @@ lazy val compilerInterface = (project in file("compiler-interface"))
     },
   )
 
-lazy val utilInterface = (project in file("util-interface"))
-  .settings(
-    commonSettings,
-    name := "Util Interface",
-    mimaPreviousArtifacts := Set(
-      "1.0.0", "1.0.1", "1.0.2", "1.0.3",
-      "1.1.0", "1.1.1", "1.1.2", "1.1.3",
-      "1.2.0", "1.2.1"
-    ) map (version =>
-      organization.value %% moduleName.value % version
-        cross (if (crossPaths.value) CrossVersion.binary else CrossVersion.disabled)
-    )
-  )
-
 ThisBuild / organization := "org.scala-sbt"
 ThisBuild / organizationName := "sbt"
 ThisBuild / organizationHomepage := Some(url("https://www.scala-sbt.org/"))