tests: enable gssapi in travis-ci linux build

Closes https://github.com/curl/curl/pull/1687

diff --git a/.travis.yml b/.travis.yml
index 6efc8d7056d3d52782251f677d8b72d8dc1ecdbc..82e3edb7adc4521af63db91ba11592139731b436 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,13 +18,14 @@ addons:
             - stunnel4
             - libidn2-0-dev
             - libssh2-1-dev
+            - krb5-user
 
 matrix:
     include:
         - os: linux
           compiler: gcc
           dist: trusty
-          env: T=normal
+          env: T=normal C=--with-gssapi
         - os: linux
           compiler: gcc
           dist: trusty