rely on the automatically defined QT_BUILD_*_LIB

Change-Id: I8c1c755270aa0a703103925656f7c1b555e4db1f
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/multimedia/qtmultimediaquicktools_headers/qtmultimediaquickdefs_p.h

@@ -48,7 +48,7 @@
 #include <QtCore/qglobal.h>
 
 #ifndef QT_STATIC
-#    if defined(QT_BUILD_QTMM_QUICK_LIB)
+#    if defined(QT_BUILD_QTMULTIMEDIAQUICKTOOLS_LIB)
 #        define Q_MULTIMEDIAQUICK_EXPORT Q_DECL_EXPORT
 #    else
 #        define Q_MULTIMEDIAQUICK_EXPORT Q_DECL_IMPORT

src/qtmultimediaquicktools/qtmultimediaquicktools.pro

 TARGET = QtMultimediaQuick_p
+
 QT = core quick multimedia-private
 CONFIG += internal_module
 
-DEFINES += QT_BUILD_QTMM_QUICK_LIB
-
 # Header files must go inside source directory of a module
 # to be installed by syncqt.
 INCLUDEPATH += ../multimedia/qtmultimediaquicktools_headers/