twain_32/tests: Link with twain_32.dll.

[Alexandre Julliard]

Francois Gouget <fgouget at free.fr> writes:

>  * In the test results on the website, it will be clear that the dll 
>    was not installed if that's the case, whereas with LoadLibrary() it
>    will just be one more skip() lost in a sea of skips.

If the dll is not present then winetest won't even run the test, it
doesn't make any difference whether it's imported statically or
dynamically.

-- 
Alexandre Julliard
julliard at winehq.org