Debugger: Use target not host architecture in QDateTime dumper

Task-number: QTCREATORBUG-11164

Change-Id: I83bd56f91c1e5342e1a755638c794dde7f5b345a
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

share/qtcreator/debugger/gdbbridge.py

@@ -892,6 +892,10 @@ class Dumper(DumperBase):
     def isQnxTarget(self):
         return 'qnx' in gdb.TARGET_CONFIG.lower()
 
+    def isWindowsTarget(self):
+        # We get i686-w64-mingw32
+        return 'mingw' in gdb.TARGET_CONFIG.lower()
+
     def qtVersionString(self):
         try:
             return str(gdb.lookup_symbol("qVersion")[0].value()())