.gitignore: Add .dirstamp
diff --git a/.gitignore b/.gitignore
index 3909aa4..616a1a8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@
 ctags
 cscope.out
 .libs
+.dirstamp
 /aclocal.m4
 /autom4te.cache
 /build-aux/