Fix hiding pkg-config output

Some version of pkg-config prints to stdout their usage

Author: glensc

setup.py

@@ -49,7 +49,7 @@
     pkgcfg.close()
 
 else:
-    if os.system('pkg-config --help 2> /dev/null') == 0:
+    if os.system('pkg-config --help 2>&1 >/dev/null') == 0:
         print("""pkg-config could not find fuse:
 you might need to adjust PKG_CONFIG_PATH or your
 FUSE installation is very old (older than 2.1-pre1)""")