gdiplus: Add GdipSetStringFormatFlags stub.

dlls/gdiplus/gdiplus.spec

@@ -587,7 +587,7 @@
 @ stdcall GdipSetSolidFillColor(ptr ptr)
 @ stdcall GdipSetStringFormatAlign(ptr long)
 @ stub GdipSetStringFormatDigitSubstitution
-@ stub GdipSetStringFormatFlags
+@ stdcall GdipSetStringFormatFlags(ptr long)
 @ stdcall GdipSetStringFormatHotkeyPrefix(ptr long)
 @ stdcall GdipSetStringFormatLineAlign(ptr long)
 @ stub GdipSetStringFormatMeasurableCharacterRanges

dlls/gdiplus/stringformat.c

@@ -28,6 +28,9 @@
 
 #include "gdiplus.h"
 #include "gdiplus_private.h"
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
 
 GpStatus WINGDIPAPI GdipCreateStringFormat(INT attr, LANGID lang,
     GpStringFormat **format)
@@ -142,3 +145,10 @@ GpStatus WINGDIPAPI GdipSetStringFormatTrimming(GpStringFormat *format,
 
     return Ok;
 }
+
+GpStatus WINGDIPAPI GdipSetStringFormatFlags(GDIPCONST GpStringFormat *format, INT flags)
+{
+    FIXME("format (%p) flags (%d)\n", format, flags);
+
+    return Ok;
+}