Read bundled runtime version from build.txt in 'kotlinc' directory, not from plugin version

compiler/util/src/org/jetbrains/kotlin/utils/KotlinPaths.java

@@ -50,4 +50,7 @@ public interface KotlinPaths {
 
     @NotNull
     File getCompilerPath();
+
+    @NotNull
+    File getBuildNumberFile();
 }

compiler/util/src/org/jetbrains/kotlin/utils/KotlinPathsFromHomeDir.java

@@ -88,6 +88,12 @@ public class KotlinPathsFromHomeDir implements KotlinPaths {
         return getLibraryFile(PathUtil.KOTLIN_COMPILER_JAR);
     }
 
+    @NotNull
+    @Override
+    public File getBuildNumberFile() {
+        return new File(homePath, "build.txt");
+    }
+
     @NotNull
     private File getLibraryFile(@NotNull String fileName) {
         return new File(getLibPath(), fileName);