tests: don't install libxml2 on MacOS

It is shipped and Homebrew will fail if we try to install it.

diff --git a/tests/ci/install.sh b/tests/ci/install.sh
index fbef05ad39e689066ae776262dd7079c324b7796..7139bdeeaff90ca4b7c063cbff2629480ef0490e 100755 (executable)
--- a/tests/ci/install.sh
+++ b/tests/ci/install.sh
@@ -9,7 +9,6 @@ case "$(uname -s)" in
 brew "automake"
 brew "autoconf"
 brew "libtool"
-brew "libxml2"
 brew "check"
 EOS
         ;;