setup.py: don't pollute the current directory with temporary files

setup.py: don't pollute the current directory with temporary files

--- a/setup.py	Tue Jul 14 16:50:37 2009 -0700
+++ b/setup.py	Tue Jul 14 17:18:45 2009 -0700
@@ -62,7 +62,7 @@
             devnull = open('/dev/null', 'w')
             oldstderr = os.dup(sys.stderr.fileno())
             os.dup2(devnull.fileno(), sys.stderr.fileno())
-            objects = cc.compile([fname])
+            objects = cc.compile([fname], output_dir=tmpdir)
             cc.link_executable(objects, os.path.join(tmpdir, "a.out"))
         except:
             return False