[libava/win32]: Don't add dll[im/ex]port attributes to libgcj, unless dll build

[Mohan Embar]

Hi People,

>Danny> The following patch is ugly, but fixes the problem with static
>Danny> libgcj.a on windows, while allowing the declaration of
>Danny> dllimport/export attributes if building libgcj.as dll.

>I'd like one of the Windows folks to comment on this.

This looks fine to me. Sorry I've been lazy about following up
on this.

Should we not also define GCJ_DLL in configure.in if --enable-shared
is specified?

-- Mohan
http://www.thisiscool.com/
http://www.animalsong.org/