ci: use "brew bundle" instead of "brew install"

Otherwise, when a dependency is already installed and not up-to-date,
we get an error.

diff --git a/tests/ci/install.sh b/tests/ci/install.sh
index 51c693d04d087433e257056cdabc7ac9c7d81f30..a8ed1679f6cd0af474d5eb9ed130d2dd98f19139 100755 (executable)
--- a/tests/ci/install.sh
+++ b/tests/ci/install.sh
@@ -5,7 +5,11 @@ set -e
 case "$(uname -s)" in
     Darwin)
         brew update
-        brew install libtool libxml2 check
+        brew bundle --file=- <<-EOS
+brew "libtool"
+brew "libxml2"
+brew "check"
+EOS
         ;;
     Linux)
         sudo apt-get -qqy update