Fall back to copy when File.symlink raises TypeError on Windows

Gem::Package#create_symlink already falls back to FileUtils.cp_r on
Windows when symlink creation hits Errno::EACCES (Developer Mode off),
but JRuby 10.1 surfaces the same failure as TypeError from its
internal wincode path helper. Treat TypeError as the same recoverable
condition so JRuby/Windows users extracting a tarball that ships
symlinks get the copy fallback rather than a crash.

Author: hsbt

lib/rubygems/package.rb

@@ -743,9 +743,11 @@ def limit_read(io, name, limit)
   if Gem.win_platform?
     # Create a symlink and fallback to copy the file or directory on Windows,
     # where symlink creation needs special privileges in form of the Developer Mode.
+    # JRuby on Windows raises TypeError from the wincode path-conversion helper
+    # when it cannot create the symlink, so fall back to copy in that case too.
     def create_symlink(old_name, new_name)
       File.symlink(old_name, new_name)
-    rescue Errno::EACCES
+    rescue Errno::EACCES, TypeError
       from = File.expand_path(old_name, File.dirname(new_name))
       FileUtils.cp_r(from, new_name)
     end