QmlJS: Fix resolving of implicit dependencies

If the QtQuick import was less than 2.15 implicit dependencies
were not properly resolved.
For example if a type from a module derives from QtQml.QtObject.

Change-Id: I42a3320ee91496da0991de2018efcd124d56f6cd
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@qt.io>

src/libs/qmljs/qmljslink.cpp

@@ -492,8 +492,11 @@ bool LinkPrivate::importLibrary(const Document::Ptr &doc,
     for (const auto &toImport : libraryInfo.imports()) {
         QString importName = toImport.module;
         ComponentVersion vNow = toImport.version;
-        // there was a period in which no version == auto, should we add || !vNow.isValid() to the if?
-        if (toImport.flags & QmlDirParser::Import::Auto)
+        /* There was a period in which no version == auto
+         * Required for QtQuick imports less than 2.15
+         */
+        if ((toImport.flags & QmlDirParser::Import::Auto)
+                || !vNow.isValid())
             vNow = version;
         Import subImport;
         subImport.valid = true;