gitignore: *-libtool for differing platforms

Change-Id: Ia8c011b53d4256305e70f78372a4aa0019b1131b
diff --git a/.gitignore b/.gitignore
index 3a64e7e..39edc1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,9 @@
 libtool
 libosmocore-*.tar.*
 
+# libtool for different platforms like arm-poky-linux-gnueabi-libtool
+*-libtool
+
 Doxyfile.core
 Doxyfile.gsm
 Doxyfile.vty