Revert "MSVC compile fix"

This reverts commit 4c29c61a75.

src/plugins/qt4projectmanager/qt-maemo/maemodeviceconfigurations.cpp

@@ -155,7 +155,7 @@ private:
         int port = 0;
         do {
             const char next = nextChar();
-            if (!isdigit(next))
+            if (!std::isdigit(next))
                 break;
             port = 10*port + next - '0';
             ++m_pos;