update swig task

Rakefile

@@ -16,12 +16,12 @@ end
 task :default => [:compile, :test]
 
 task :swig do
-  run("swig -DLIBMEMCACHED_WITH_SASL_SUPPORT -Iext/libmemcached-0.32 -ruby -autorename -o ext/rlibmemcached_wrap.c.in ext/rlibmemcached.i", "Running SWIG")
+  run("swig -DLIBMEMCACHED_WITH_SASL_SUPPORT -Iext/rlibmemcached/libmemcached-0.32 -ruby -autorename -o ext/rlibmemcached/rlibmemcached_wrap.c.in ext/rlibmemcached/rlibmemcached.i", "Running SWIG")
   swig_patches = {
     "#ifndef RUBY_INIT_STACK" => "#ifdef __NEVER__" # Patching SWIG output for JRuby.
   }.map{|pair| "s/#{pair.join('/')}/"}.join(';')
   # sed has different syntax for inplace switch in BSD and GNU version, so using intermediate file
-  run("sed '#{swig_patches}' ext/rlibmemcached_wrap.c.in > ext/rlibmemcached_wrap.c", "Apply patches to SWIG output")
+  run("sed '#{swig_patches}' ext/rlibmemcached/rlibmemcached_wrap.c.in > ext/rlibmemcached/rlibmemcached_wrap.c", "Apply patches to SWIG output")
 end
 
 task :exceptions do