gitignore:  We don't care about files ending in '~'

Change-Id: I0ed8ae6caaba0b2f04f55b08cb54abc358e9ce0d
diff --git a/.gitignore b/.gitignore
index 476d0bb..aa35be4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 *.so
 *.o
 *.a
+*~
 __pycache__
 
 # Intermediate language files