Fix gradle support for non-kts scripts when daemon is used

compiler/daemon/src/org/jetbrains/kotlin/daemon/CompileServiceImpl.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.Disposable
 import com.intellij.openapi.util.Disposer
 import com.intellij.openapi.vfs.impl.ZipHandler
 import com.intellij.openapi.vfs.impl.jar.CoreJarFileSystem
+import org.jetbrains.kotlin.build.DEFAULT_KOTLIN_SOURCE_FILES_EXTENSIONS
 import org.jetbrains.kotlin.build.JvmSourceRoot
 import org.jetbrains.kotlin.cli.common.CLICompiler
 import org.jetbrains.kotlin.cli.common.ExitCode
@@ -559,6 +560,13 @@ class CompileServiceImpl(
         k2jvmArgs.commonSources = parsedModule.modules.flatMap { it.getCommonSourceFiles() }.toTypedArray().takeUnless { it.isEmpty() }
 
         val allKotlinFiles = parsedModule.modules.flatMap { it.getSourceFiles().map(::File) }
+        val allKotlinExtensions = (
+                DEFAULT_KOTLIN_SOURCE_FILES_EXTENSIONS +
+                        allKotlinFiles.asSequence()
+                            .map { it.extension }
+                            .filter { !it.equals("java", ignoreCase = true) }
+                            .asIterable()
+                ).distinct()
         k2jvmArgs.friendPaths = parsedModule.modules.flatMap(Module::getFriendPaths).toTypedArray()
 
         val changedFiles = if (incrementalCompilationOptions.areFileChangesKnown) {
@@ -592,7 +600,8 @@ class CompileServiceImpl(
             buildHistoryFile = incrementalCompilationOptions.multiModuleICSettings.buildHistoryFile,
             localStateDirs = incrementalCompilationOptions.localStateDirs,
             usePreciseJavaTracking = incrementalCompilationOptions.usePreciseJavaTracking,
-            modulesApiHistory = modulesApiHistory
+            modulesApiHistory = modulesApiHistory,
+            kotlinSourceFilesExtensions = allKotlinExtensions
         )
         return compiler.compile(allKotlinFiles, k2jvmArgs, compilerMessageCollector, changedFiles)
     }