On Windows: Properly detect the right name of the perl library file on
Windows, for newer perl versions that sometimes generate a .lib file
with the more linux like libperl158.a name.

* build/generator/gen_win_dependencies.py
  (_find_perl): Ask perl for the library name instead of guessing one
    ourselves.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1617030 13f79535-47bb-0310-9956-ffa450edef68