[ft2-demos][win32] Compiler Warnings

[Anuj Verma]

Hello,

There are a couple of warnings in the win32 subsystem of the

freetype-2 demos. I have attached a patch to fix those.

I can also see a lot of the below warning

```

src/base/ftsystem.c: In function 'FT_Stream_Open':
src/base/ftsystem.c:282:3: warning: visibility attribute not supported in this configuration; ignored [-Wattributes]
   }
   ^

```

I don't know what it is. I think it's specific to windows as I don't

see this on linux. I'm using GCC 8.3.0 and GNU Make 4.3 to

compile on windows.

Anuj

ft2demos.diff
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