Explicitly enable exceptions

Exceptions can be disabled implicitly on some platforms
or when configuring with -no-exceptions. Make sure
we explicitly enable them for this module as it uses
them internally.

Change-Id: I17cf730a8afdd5b7d1700c9ab3104e131a095936
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/xmlpatterns/xmlpatterns.pro

@@ -3,7 +3,7 @@ load(qt_module)
 TARGET     = QtXmlPatterns
 QPRO_PWD   = $$PWD
 
-CONFIG += module
+CONFIG += module exceptions
 MODULE_PRI += ../../modules/qt_xmlpatterns.pri
 
 QT = core-private network