GCC produces a lot of warnings about ignored dllimport/dllexport attributes.
Detecting real problems from build output will be easier with this warnings turned off.
`man winegcc`
> The dllimport/dllexport attributes are not supported at the moment,
> due to lack of support for these features in the ELF version of gcc.
`man gcc`
> -Wno-attributes
> Do not warn if an unexpected "__attribute__" is used,
> such as unrecognized attributes, function attributes applied to variables, etc.
> This does not stop errors for incorrect use of supported attributes.
