gdiplus: Add a stub for GdipGetCustomLineCapBaseInset.

dlls/gdiplus/customlinecap.c

@@ -140,3 +140,14 @@ GpStatus WINGDIPAPI GdipSetCustomLineCapBaseCap(GpCustomLineCap* custom,
 
     return NotImplemented;
 }
+
+GpStatus WINGDIPAPI GdipGetCustomLineCapBaseInset(GpCustomLineCap* custom,
+    REAL* inset)
+{
+    static int calls;
+
+    if(!(calls++))
+        FIXME("not implemented\n");
+
+    return NotImplemented;
+}

dlls/gdiplus/gdiplus.spec

@@ -250,7 +250,7 @@
 @ stdcall GdipGetCompositingMode(ptr ptr)
 @ stdcall GdipGetCompositingQuality(ptr ptr)
 @ stub GdipGetCustomLineCapBaseCap
-@ stub GdipGetCustomLineCapBaseInset
+@ stdcall GdipGetCustomLineCapBaseInset(ptr ptr)
 @ stub GdipGetCustomLineCapStrokeCaps
 @ stub GdipGetCustomLineCapStrokeJoin
 @ stub GdipGetCustomLineCapType