Add definitions for Q_DECL_DEPRECATED and Q_DECL_DEPRECATED_X (danmar#7510)

Add support for Qt macros Q_DECL_DEPRECATED and Q_DECL_DEPRECATED_X
for people using the Qt library.

Author: winterz

cfg/qt.cfg

@@ -5326,6 +5326,8 @@
   <define name="Q_NAMESPACE_EXPORT" value=""/>
   <define name="Q_DECL_EXPORT" value=""/>
   <define name="Q_DECL_IMPORT" value=""/>
+  <define name="Q_DECL_DEPRECATED" value=""/>
+  <define name="Q_DECL_DEPRECATED_X(text)" value=""/>
   <define name="QT_DECLARE_DEPRECATED_TR_FUNCTIONS(context)" value="static inline QString trUtf8(const char *sourceText, const char *disambiguation = Q_NULLPTR, int n = -1) { return QCoreApplication::translate(#context, sourceText, disambiguation, n); }"/>
   <define name="Q_DECLARE_FLAGS(x,y)" value=""/>
   <define name="Q_DECLARE_SEQUENTIAL_ITERATOR(C)" value=""/>