Drop contrib/ci.sh

This is unused and outdated (Autotools is no longer supported).

Signed-off-by: Simon Ser <contact@emersion.fr>
diff --git a/contrib/ci.sh b/contrib/ci.sh
deleted file mode 100755
index 48b3e77..0000000
--- a/contrib/ci.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-
-set -ex
-
-./autogen.sh
-make -sj4 check