ci: enable use of meson again

.travis.yml

@@ -13,6 +13,10 @@ d:
   - dmd-nightly
   - ldc-latest-ci
 
+env:
+  global:
+    - TEST_MESON=true
+
 before_install:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get update && sudo apt-get -y install python3-pip python3-setuptools; fi
   - pip3 install meson ninja

travis.sh

@@ -11,5 +11,7 @@ if [ ! -z "${COVERAGE:-}" ]; then
 else
     dub test
 
-    meson build && ninja -C build || echo Warning: Meson build failed!
+    if [ "x$TEST_MESON" = "xtrue" ] && ! [ "x$TRAVIS_COMPILER" = "xdmd"  && $(dmd --version | head -n1) = "DMD64 D Compiler v2.085.1"]; then
+        meson build && ninja -C build
+    fi
 fi