Copy qmldir file even for prefix builds

The qmldir file is needed in the build dir for non-installed
static builds, so that qmlimportscanner can work.

Change-Id: I9028db6d1e36da5a2be9b0c1ba4c9d475edd5cb5
Task-number: QTBUG-53926
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

mkspecs/features/qml_module.prf

@@ -18,10 +18,15 @@ fq_qml_files = $$qmldir_file
 
 for(qmlf, QML_FILES): fq_qml_files += $$absolute_path($$qmlf, $$_PRO_FILE_PWD_)
 
-qml1_target: \
+load(qt_build_paths)
+
+qml1_target {
+    DESTDIR = $$MODULE_BASE_OUTDIR/imports/$$TARGETPATH
     instbase = $$[QT_INSTALL_IMPORTS]
-else: \
+} else {
+    DESTDIR = $$MODULE_BASE_OUTDIR/qml/$$TARGETPATH
     instbase = $$[QT_INSTALL_QML]
+}
 
 !qml1_target:static: CONFIG += builtin_resources
 
@@ -41,4 +46,11 @@ else: qmldir.files = $$qmldir_file
 qmldir.path = $$instbase/$$TARGETPATH
 INSTALLS += qmldir
 
-!prefix_build: COPIES += qmldir
+!prefix_build {
+    COPIES += qmldir
+} else {
+    # For non-installed static builds, qmlimportscanner needs qmldir file in build dir
+    qmldir2build.files = $$qmldir_file
+    qmldir2build.path = $$DESTDIR
+    COPIES += qmldir2build
+}