remove dependency on google diffutil

Author: bishabosha

compiler/test/dotty/tools/dotc/semanticdb/DiffAssertions.scala

@@ -17,7 +17,6 @@ import org.junit.experimental.categories.Category
 
 import dotty.BootstrappedOnlyTests
 import dotty.tools.dotc.Main
-import dotty.tools.dotc.semanticdb.DiffAssertions._
 import dotty.tools.dotc.semanticdb.Scala3.given
 import dotty.tools.dotc.util.SourceFile
 
@@ -48,10 +47,9 @@ class SemanticdbTests with
         val expected = new String(Files.readAllBytes(expectPath), StandardCharsets.UTF_8)
         val expectName = expectPath.getFileName
         val relExpect = rootSrc.relativize(expectPath)
-        collectFailingDiff(expected, obtained, s"a/$relExpect", s"b/$relExpect") {
+        if expected.trim != obtained.trim then
           Files.write(expectPath.resolveSibling("" + expectName + ".out"), obtained.getBytes(StandardCharsets.UTF_8))
           errors += expectPath
-        }
     for source <- inputFiles().sorted do
       val filename = source.getFileName.toString
       val relpath = expectSrc.relativize(source)

compiler/test/dotty/tools/dotc/semanticdb/SemanticdbTests.scala

@@ -502,7 +502,6 @@ object Build {
       libraryDependencies ++= Seq(
         "org.scala-lang.modules" % "scala-asm" % "7.0.0-scala-1", // used by the backend
         Dependencies.`compiler-interface`,
-        "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0", // for SemanticdbTests
         "org.jline" % "jline-reader" % "3.9.0",   // used by the REPL
         "org.jline" % "jline-terminal" % "3.9.0",
         "org.jline" % "jline-terminal-jna" % "3.9.0" // needed for Windows