[libgtop] Ignore the `free` example binary.

[Benoît Dejean <bdejean src gnome org>]

commit 1908c00d32674e3fae2b3cb0d83a9d7609f6e616
Author: Benoît Dejean <bdejean gmail com>
Date:   Tue Jul 14 11:21:45 2015 +0200

    Ignore the `free` example binary.

 .gitignore |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 9c941b1..4a34ddf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,7 +44,7 @@ doc/version.texi
 examples/affinity
 examples/df
 examples/first
-examples/mem
+examples/free
 examples/mountlist
 examples/netlist
 examples/netload