Fix windows-specific usage of CFX_WideStr::operator LPCWSTR().

core/include/fxge/fx_ge_win32.h

Index: core/include/fxge/fx_ge_win32.h
diff --git a/core/include/fxge/fx_ge_win32.h b/core/include/fxge/fx_ge_win32.h
index 311d355ef7f30ee5db45da20a347c72d583f16f5..d39a8071e3be5a1f5a8a592897f8fbe0ef3a5a70 100644
--- a/core/include/fxge/fx_ge_win32.h
+++ b/core/include/fxge/fx_ge_win32.h
@@ -38,7 +38,7 @@ public:
 
     static CFX_DIBitmap* LoadFromFile(FX_LPCSTR filename)
     {
-        return LoadFromFile(CFX_WideString::FromLocal(filename));
+        return LoadFromFile(CFX_WideString::FromLocal(filename).c_str());
     }
 
     static CFX_DIBitmap* LoadDIBitmap(WINDIB_Open_Args_ args);