[ci] Use default build system until cmake is fixed.

.travis.yml

@@ -8,10 +8,8 @@ sudo: required
 before_install:
   - wget http://www.cmake.org/files/v3.2/cmake-3.2.3-Linux-x86_64.sh
   - sudo sh cmake-3.2.3-Linux-x86_64.sh --skip-license --prefix=/usr
+  - sudo apt-get install libtommath0 libtommath-dev
 
 script:
-  - cmake -H. -Bbuild
-  - cd build
+  - ./autogen.sh
   - make
-  #- ./autogen.sh
-  #- make