Drop C++ header compatibility test (#718)

The $CXX environment variable is not exported under the 'c' language on Travis.

diff --git a/.travis.yml b/.travis.yml
index 1e105dc088a57de32a6444bd601b1def53ae8019..903950041ad01a3ce56c134f31cbe279d054fffa 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -79,8 +79,6 @@ before_script:
 script:
   # `-r -w` implicitly provided through `make buildbottest`.
   - make buildbottest TESTOPTS="-j4"
-  # Test for C++ header compatibility.
-  - echo '#include "Python.h"' > test.cc && $CXX -c test.cc -o /dev/null -I ./Include -I .
 
 notifications:
   email: false