updated for version 7.4.398
Problem:    Gcc error for the argument of InterlockedIncrement() and
            InterlockedDecrement(). (Axel Bender)
Solution:   Remove "unsigned" from the cRefCount_ declaration.
diff --git a/src/gui_dwrite.cpp b/src/gui_dwrite.cpp
index cf83c05..d4c43a3 100644
--- a/src/gui_dwrite.cpp
+++ b/src/gui_dwrite.cpp
@@ -377,7 +377,7 @@
     }
 
 private:
-    unsigned long cRefCount_;
+    long cRefCount_;
     IDWriteBitmapRenderTarget* pRenderTarget_;
     IDWriteRenderingParams* pRenderingParams_;
 };