winbuild: prefer documented zlib library names

Check for existence of import and static libraries with documented names
and use them if they do. Fallback to previous names.

According to
https://github.com/madler/zlib/blob/master/win32/README-WIN32.txt on
Windows, the names of the import library is "zdll.lib" and static
library is "zlib.lib".

closes #2354