Allow passing multi-line strings to wxDC::DrawText(), even under MSW.

Native wxMSW wxDC::DrawText() implementation doesn't support multi-line
strings so use the generic wxDC::DrawLabel() code instead. Drawing multi-line
strings now works at least in wxGTK and wxMSW, to be tested for the other
platforms.

Closes #12239.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65058 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dc.h

@@ -596,7 +596,12 @@ public:
 
         The coordinates refer to the top-left corner of the rectangle bounding
         the string. See GetTextExtent() for how to get the dimensions of a text
-        string, which can be used to position the text more precisely.
+        string, which can be used to position the text more precisely and
+        DrawLabel() if you need to align the string differently.
+
+        Starting from wxWidgets 2.9.2 @a text parameter can be a multi-line
+        string, i.e. contain new line characters, and will be rendered
+        correctly.
 
         @note The current @ref GetLogicalFunction() "logical function" is
               ignored by this function.