Disable X11 in Chez CI bootstrap (no libx11-dev available)

Jaime Fournier

657a185787a3b0c3d57e5d20423318cbb92edaf3

diff --git a/.builds/ci.yml b/.builds/ci.yml
index 39a09a8..e6e7ab8 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -21,7 +21,7 @@ artifacts:
 tasks:
 - build-jerboa: |
     cd jerboa
-    make jerboa
+    make jerboa CHEZ_CONFIGURE_EXTRA=--disable-x11
     echo 'export PATH="$HOME/jerboa/dist:$PATH"' >> ~/.buildenv
 - package: |
     cd jerboa-duckdb