[RFC 2/1] linux: remove Pathname stdlib dependency

[Eric Wong <e@80x24.org>]

The File.readlink has been available since the earliest SVN import
of Ruby from Jan 16 1998.  There's no reason to load the Pathname
class here since we don't do any further pathname manipulation.

So avoid loading the extra .so here and creating extra objects.
---
 Noticed while reviewing "[RFC] linux: workaround Ruby 2.3 change"
 http://bogomips.org/raindrops-public/20160202183136.21549-1-e@80x24.org/raw

 lib/raindrops/linux.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/raindrops/linux.rb b/lib/raindrops/linux.rb
index a38fa64..4166ec7 100644
--- a/lib/raindrops/linux.rb
+++ b/lib/raindrops/linux.rb
@@ -8,7 +8,6 @@
 # Instead of snapshotting, Raindrops::Aggregate::LastDataRecv may be used
 # to aggregate statistics from +all+ accepted sockets as they arrive
 # based on the +last_data_recv+ field in Raindrops::TCP_Info
-require 'pathname'
 
 module Raindrops::Linux
 
@@ -46,7 +45,7 @@ module Raindrops::Linux
         path.force_encoding(Encoding::BINARY) if defined?(Encoding)
         if File.symlink?(path)
           link = path
-          path = Pathname.new(link).realpath.to_s
+          path = File.readlink(link)
           path.force_encoding(Encoding::BINARY) if defined?(Encoding)
           rv[link] = rv[path] # vivify ListenerStats
         else
-- 
EW