Add syntax highlighting for *.def files

konan/library-reader/src/org/jetbrains/kotlin/konan/library/KonanLibraryConstants.kt

@@ -14,6 +14,8 @@ const val KLIB_FILE_EXTENSION_WITH_DOT = ".$KLIB_FILE_EXTENSION"
 const val KLIB_METADATA_FILE_EXTENSION = "knm"
 const val KLIB_METADATA_FILE_EXTENSION_WITH_DOT = ".$KLIB_METADATA_FILE_EXTENSION"
 
+const val KDEFINITIONS_FILE_EXTENSION = "def"
+
 const val KLIB_MODULE_METADATA_FILE_NAME = "module"
 
 const val KONAN_STDLIB_NAME = "stdlib"