[gobject-introspection] Add generated tarballs to .gitignore

[Colin Walters <walters src gnome org>]

commit c039cf4e35a861b15ac1e773374ddf1e62d151e7
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Thu Apr 25 16:59:30 2013 +0200

    Add generated tarballs to .gitignore
    
    https://bugzilla.gnome.org/show_bug.cgi?id=699531

 .gitignore |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 97b881c..7d1776d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -89,6 +89,9 @@ tests/*/*.log
 tests/*/*.trs
 .make-check-passed
 
+# tarballs
+*.tar.xz
+
 # Generated Visual Studio project files
 build/win32/vs10/cmph.vcxproj
 build/win32/vs10/cmph.vcxproj.filters