Disable optional Chez UI deps in SourceHut build

ober

6b9e39c463813bc649e7238bbc35baf8cee75647

diff --git a/.build.yml b/.build.yml
index fb75082..8546d11 100644
--- a/.build.yml
+++ b/.build.yml
@@ -13,7 +13,7 @@ sources:
 tasks:
   - jerboa: |
       cd jerboa
-      make binary
+      make binary CHEZ_INSTALL_FLAGS="--threads --enable-harden --disable-x11 --disable-curses --disable-iconv --installprefix=$PWD/.chez --installbin=$PWD/.chez/bin --installlib=$PWD/.chez/lib --installman=$PWD/.chez/share/man --installdoc=$PWD/.chez/share/doc"
   - smoke: |
       cd jerboa-android
       JERBOA=../jerboa/jerboa-bin make test