actually don't install qt dlls into lib/ any more

it helps enormously to use the flag correctly.

amends f0c34eb08f.

Change-Id: I04a63cc59e133169d9f6677f2f88ef98fd5c524c
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

mkspecs/features/qt_build_config.prf

@@ -59,7 +59,6 @@ CONFIG += \
     create_prl link_prl \
     prepare_docs qt_docs_targets \
     no_private_qt_headers_warning QTDIR_build \
-    no_dll \
     # Qt modules get compiled without exceptions enabled by default.
     # However, testcases should be still built with exceptions.
     exceptions_off testcase_exceptions

mkspecs/features/qt_installs.prf

@@ -22,6 +22,7 @@
         target.path = $$[QT_HOST_LIBS]
     else: \
         target.path = $$[QT_INSTALL_LIBS]
+    target.CONFIG = no_dll
     INSTALLS += target
 }