Fix WtFindHaru.txt on Windows for libHaru 2.4.3
libHaru now calls its lib files
hpdfd.lib (both for static and dynamic libraries), instead of the old
We'll need to fix
cmake/WtFindHaru.txt to find the libHaru libs with these new names properly.
Wt 4.9.0 was accidentally built without PDF support as a result of this. In the future, we could perhaps also make it automatically verifiable that Wt is actually built with all of the desired features.