[Maven] Filter duplicated source roots to avoid multiple module declarations exception

After fixing of KT-13995 (99de93bb) there is a case when several maven plugins register the same source roots twice, which leads to the Kotlin compiler exception "Too many source module declarations found". kotlin-maven-plugin should take care of what it passes to the Kotlin compiler to avoid it

#KT-58048 Fixed

Merge-request: KT-MR-9663
Merged-by: Aleksei Cherepanov <aleksei.cherepanov@jetbrains.com>

libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java

@@ -41,6 +41,7 @@ import java.lang.reflect.Field;
 import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 import static org.jetbrains.kotlin.maven.Util.joinArrays;
 
@@ -82,7 +83,7 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
         List<String> list = new ArrayList<>();
         if (sourceDirs != null && !sourceDirs.isEmpty()) list.addAll(sourceDirs);
         list.addAll(project.getCompileSourceRoots());
-        return list;
+        return list.stream().distinct().collect(Collectors.toList());
     }
 
     @NotNull