travis: Exclude linux/clang from the build matrix

Roger Leigh · jbeder · commit beb44b872c07 · 2017-08-24T22:49:17.000-05:00
The combination of clang++ 3.4 with libstdc++ from GCC 4.6
doesn't work.
diff --git a/.travis.yml b/.travis.yml
@@ -21,3 +21,8 @@ before_script:
 script:
   - make
   - test/run-tests
+
+matrix:
+  exclude:
+  - os: linux
+    compiler: clang
