[bug-libunistring] undefined _UNUSED_PARAMETER_

[Mike Gran]

Hi-

In libunistring 0.9.1.1, _UNUSED_PARAMETER_  is used as a parameter
modifier for two functions in unistr.h, but, is not defined.

I see from the source that _UNUSED_PARAMETER is defined in 
libunistring's config.h, but, it isn't defined any header that gets installed.

This is built on i686-pc-linux-gnu with gcc 4.3.2.

Thanks,

-Mike Gran