Fix exports for shared libraries

We use "shared" to define a shared library and not dll.

Change-Id: Ia97ebd0042a7ef0f33eadaa448d9a44b42331ad1
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

src/plugins/qmljstools/qmljstools.pro

@@ -2,7 +2,7 @@ include(../../qtcreatorplugin.pri)
 
 DEFINES += QMLJSTOOLS_LIBRARY
 
-!contains(CONFIG, dll) {
+!shared {
     DEFINES += QMLJSTOOLS_STATIC
 }