build: Add a simple gitignore file...

We can not ignore the build files right now as they are
checked in and we would need to remove that from repo first.
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f9bd6bc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+aclocal.m4
+*.o
+*.lo
+*.a
+*.la
+.deps
+.libs