Run Coverity scan on a single machine

.travis.yml

@@ -1,33 +1,13 @@
 language: cpp
 
-os:
-  - linux
-  - osx
-
 env:
   global:
-    - secure: |-
-        Gsnp9ERFnXt+diCfc7Vb72g+7HDn1MCHvw4zfUDdoBh9bxxFlLQRlzZZfwWhzni57lflrt
-        0QHXafu+oBVOJuNv6WauV3+ZyuWIQRmNGjZFNLvZsXHK/dyad2vGQBPvEkb+8l/aCyTpbr
-        6pxmyzLHSn1ZR7OX5rfPvwM3tOyZ3H0=
     # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
     # via the "travis encrypt" command using the project repo's public key.
     - secure: |-
         Edkq75sWlKsPhiffnpAYxDm9E9zGg1Hf3rOwSlMZjwS5BmcjU3iteTXfS+cSUbh4YAbgc+
         3OK+oKtCg7YV0X7AFmz/YOy0Ch8RXM4p0NxV/+OONjno77MsgFVkV41L2wilp5IXbz8nWl
         j/HBbZMLPRqtHqEBHMUKGy4VEKq9sBg=
-  matrix:
-    - BUILD=Doc
-    - BUILD=Debug
-    - BUILD=Release
-
-matrix:
-  exclude:
-    - os: osx
-      env: BUILD=Doc
-
-script:
-  - support/travis-build.py
 
 addons:
   coverity_scan: