meson build fails

[jshanab]

When trying gst-build libcaca failed because the macro in caca0.h is of unsupported syntax fro VS
I gurded and changed to the syntax in the documentation for MS to get it to build

#if defined _MSC_VER
  #define caca_printf(x, y, f, ...) caca_printf(__caca0_cv, x, y, f, __VA_ARGS__)
#else
  #define caca_printf(x, y, f, z...) caca_printf(__caca0_cv, x, y, f, ##z)
#endif

[rofl0r]

you should put the pasted part into triple-backquotes, because currently it is interpreted as markdown.
example

```
code goes here
```