travis: Make Mesonbuild non-optional
diff --git a/.travis.yml b/.travis.yml
index b3a6543..ad2b429 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -178,7 +178,7 @@
 
     # meson dedicated test
     - name: Xenial (Meson + clang)
-      env: ALLOW_FAILURES=true
+      # env: ALLOW_FAILURES=true
       dist: xenial
       language: cpp
       compiler: clang