Tools/travis-osx-install.sh: use Tools/brew-install to install Octave
diff --git a/Tools/travis-osx-install.sh b/Tools/travis-osx-install.sh
index 393d96e..9958038 100755
--- a/Tools/travis-osx-install.sh
+++ b/Tools/travis-osx-install.sh
@@ -23,7 +23,7 @@
 		travis_retry brew install lua
 		;;
 	"octave")
-		travis_retry brew install octave
+		travis_retry Tools/brew-install octave
 		;;
 	"python")
 		WITHLANG=$SWIGLANG$PY3