gdiplus: Add a stub for GdipSetCustomLineCapStrokeJoin.

dlls/gdiplus/customlinecap.c

@@ -162,3 +162,14 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapBaseInset(GpCustomLineCap* custom,
 
     return NotImplemented;
 }
+
+GpStatus WINGDIPAPI GdipSetCustomLineCapStrokeJoin(GpCustomLineCap* custom,
+    GpLineJoin join)
+{
+    static int calls;
+
+    if(!(calls++))
+        FIXME("not implemented\n");
+
+    return NotImplemented;
+}

dlls/gdiplus/gdiplus.spec

@@ -517,7 +517,7 @@
 @ stdcall GdipSetCustomLineCapBaseCap(ptr long)
 @ stdcall GdipSetCustomLineCapBaseInset(ptr long)
 @ stdcall GdipSetCustomLineCapStrokeCaps(ptr long long)
-@ stub GdipSetCustomLineCapStrokeJoin
+@ stdcall GdipSetCustomLineCapStrokeJoin(ptr long)
 @ stub GdipSetCustomLineCapWidthScale
 @ stub GdipSetEffectParameters
 @ stub GdipSetEmpty