qt: don't enable internal tslib-module debugging

In Qt there are virtually hundreds of internal debug flags like
TSLIBMOUSEHANDLER_DEBUG for every module or even C++ class. There
is no reason to enable a single such flag when Qt is build with
debugging symbols and others not.

Signed-off-by: Michael Roth <mroth@nessie.de>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/qt/qt.mk

@@ -153,8 +153,6 @@ endif
 ifeq ($(BR2_PACKAGE_QT_MOUSE_TSLIB),y)
 QT_CONFIGURE += -qt-mouse-tslib
 QT_DEP_LIBS+=tslib
-QT_TSLIB_DEB="-D TSLIBMOUSEHANDLER_DEBUG"
-QT_TSLIB_DEB:=$(call qstrip,$(QT_TSLIB_DEB))
 else
 QT_CONFIGURE += -no-mouse-tslib
 endif
@@ -165,7 +163,7 @@ QT_CONFIGURE += -no-mouse-qvfb
 endif
 
 ifeq ($(BR2_PACKAGE_QT_DEBUG),y)
-QT_CONFIGURE+= "-debug $(QT_TSLIB_DEB)"
+QT_CONFIGURE+= -debug
 else
 QT_CONFIGURE+= -release
 endif